diff --git a/cmd/L/doc.go b/cmd/L/doc.go
index 1afd7e4..390bfb3 100644
--- a/cmd/L/doc.go
+++ b/cmd/L/doc.go
@@ -15,10 +15,13 @@ attempt to find the focused window ID by connecting to acmefocused
 
 List of sub-commands:
 
-		comp [-e]
+		comp [-e] [-E]
 			Print candidate completions at the cursor position. If
 			-e (edit) flag is given and there is only one candidate,
-			the completion is applied instead of being printed.
+			the completion is applied instead of being printed. If
+			-E (Edit) flag is given, the first matching candidate is
+			applied, and all matches will be displayed in a dedicated
+			Acme window named /LSP/Completions.
 
 		def [-p]
 			Find where the symbol at the cursor position is defined
@@ -35,9 +38,10 @@ List of sub-commands:
 		impls
 			List implementation location(s) of the symbol under the cursor.
 
-		refs
+		refs [-show]
 			List locations where the symbol under the cursor is used
-			("references").
+			("references"). If -show flag is given, all references are displayed
+			in a dedicated Acme window named /LSP/References (with absolute paths)
 
 		rn <newname>
 			Rename the symbol under the cursor to newname.
@@ -75,11 +79,11 @@ List of sub-commands:
 			Current working directory is removed if no directory is specified.
 
 	  -acme.addr string
-	    	address where acme is serving 9P file system (default "/tmp/ns.fhs.:0/acme")
+	    	address where acme is serving 9P file system (default "/tmp/ns.username.:0/acme")
 	  -acme.net string
 	    	network where acme is serving 9P file system (default "unix")
 	  -proxy.addr string
-	    	address used for communication between acme-lsp and L (default "/tmp/ns.fhs.:0/acme-lsp.rpc")
+	    	address used for communication between acme-lsp and L (default "/tmp/ns.username.:0/acme-lsp.rpc")
 	  -proxy.net string
 	    	network used for communication between acme-lsp and L (default "unix")
 	  -showconfig
diff --git a/cmd/L/main.go b/cmd/L/main.go
index 9979fd6..e0b02a1 100644
--- a/cmd/L/main.go
+++ b/cmd/L/main.go
@@ -5,7 +5,7 @@ import (
 	"context"
 	"flag"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"log"
 	"net"
 	"os"
@@ -63,9 +63,10 @@ List of sub-commands:
 	impls
 		List implementation location(s) of the symbol under the cursor.
 
-	refs
+	refs [-show]
 		List locations where the symbol under the cursor is used
-		("references").
+		("references"). If -show flag is given, all references are displayed
+		in a dedicated Acme window named /LSP/References (with absolute paths)
 
 	rn <newname>
 		Rename the symbol under the cursor to newname.
@@ -231,7 +232,8 @@ func run(cfg *config.Config, args []string) error {
 	case "impls":
 		return rc.Implementation(ctx, true)
 	case "refs":
-		return rc.References(ctx)
+		args = args[1:]
+		return rc.References(ctx, len(args) > 0 && args[0] == "-show")
 	case "rn":
 		args = args[1:]
 		if len(args) < 1 {
@@ -280,7 +282,7 @@ func getFocusedWinID(addr string) (string, error) {
 			return "", fmt.Errorf("$winid is empty and could not dial acmefocused: %v", err)
 		}
 		defer conn.Close()
-		b, err := ioutil.ReadAll(conn)
+		b, err := io.ReadAll(conn)
 		if err != nil {
 			return "", fmt.Errorf("$winid is empty and could not read acmefocused: %v", err)
 		}
diff --git a/cmd/L/main_test.go b/cmd/L/main_test.go
index 367c0b0..bd42d5d 100644
--- a/cmd/L/main_test.go
+++ b/cmd/L/main_test.go
@@ -2,7 +2,6 @@ package main
 
 import (
 	"fmt"
-	"io/ioutil"
 	"net"
 	"os"
 	"path/filepath"
@@ -38,7 +37,7 @@ func TestGetFocusedWinIDFromServer(t *testing.T) {
 	os.Unsetenv("winid")
 	want := "321"
 
-	dir, err := ioutil.TempDir("", "acmefocused")
+	dir, err := os.MkdirTemp("", "acmefocused")
 	if err != nil {
 		t.Fatalf("couldn't create temporary directory: %v", err)
 	}
diff --git a/cmd/Lone/doc.go b/cmd/Lone/doc.go
index 6badb72..eb4b505 100644
--- a/cmd/Lone/doc.go
+++ b/cmd/Lone/doc.go
@@ -62,17 +62,27 @@ List of sub-commands:
 			be very useful in practice.
 
 	  -acme.addr string
-	    	address where acme is serving 9P file system (default "/tmp/ns.fhs.:0/acme")
+	    	address where acme is serving 9P file system (default "/tmp/ns.username.:0/acme")
 	  -acme.net string
 	    	network where acme is serving 9P file system (default "unix")
 	  -debug
 	    	turn on debugging prints (deprecated: use -v)
 	  -dial value
-	    	language server address for filename match (e.g. '\.go$:localhost:4389')
+	    	map filename to language server address. The format is
+	    	'handlers:host:port'. See -server flag for format of
+	    	handlers. (e.g. '\.go$:localhost:4389')
+	  -hidediag
+	    	hide diagnostics sent by LSP server
 	  -rootdir string
-	    	root directory used for LSP initialization. (default "/")
+	    	root directory used for LSP initialization (default "/")
+	  -rpc.trace
+	    	print the full rpc trace in lsp inspector format
 	  -server value
-	    	language server command for filename match (e.g. '\.go$:gopls')
+	    	map filename to language server command. The format is
+	    	'handlers:cmd' where cmd is the LSP server command and handlers is
+	    	a comma separated list of 'regexp[@lang]'. The regexp matches the
+	    	filename and lang is a language identifier. (e.g. '\.go$:gopls' or
+	    	'go.mod$@go.mod,go.sum$@go.sum,\.go$@go:gopls')
 	  -showconfig
 	    	show configuration values and exit
 	  -v	Verbose output
diff --git a/cmd/Lone/main.go b/cmd/Lone/main.go
index f8407d8..5f4287c 100644
--- a/cmd/Lone/main.go
+++ b/cmd/Lone/main.go
@@ -150,7 +150,7 @@ func run(cfg *config.Config, args []string) error {
 	case "hov":
 		err = rc.Hover(ctx)
 	case "refs":
-		err = rc.References(ctx)
+		err = rc.References(ctx, false)
 	case "rn":
 		if len(args) < 2 {
 			usage()
diff --git a/cmd/acme-lsp/doc.go b/cmd/acme-lsp/doc.go
index 669b695..13e9174 100644
--- a/cmd/acme-lsp/doc.go
+++ b/cmd/acme-lsp/doc.go
@@ -32,21 +32,31 @@ be changed by the FormatOnPut and CodeActionsOnPut configuration options.
 		Usage: acme-lsp [flags]
 
 	  -acme.addr string
-	    	address where acme is serving 9P file system (default "/tmp/ns.fhs.:0/acme")
+	    	address where acme is serving 9P file system (default "/tmp/ns.username.:0/acme")
 	  -acme.net string
 	    	network where acme is serving 9P file system (default "unix")
 	  -debug
 	    	turn on debugging prints (deprecated: use -v)
 	  -dial value
-	    	language server address for filename match (e.g. '\.go$:localhost:4389')
+	    	map filename to language server address. The format is
+	    	'handlers:host:port'. See -server flag for format of
+	    	handlers. (e.g. '\.go$:localhost:4389')
+	  -hidediag
+	    	hide diagnostics sent by LSP server
 	  -proxy.addr string
-	    	address used for communication between acme-lsp and L (default "/tmp/ns.fhs.:0/acme-lsp.rpc")
+	    	address used for communication between acme-lsp and L (default "/tmp/ns.username.:0/acme-lsp.rpc")
 	  -proxy.net string
 	    	network used for communication between acme-lsp and L (default "unix")
 	  -rootdir string
-	    	root directory used for LSP initialization. (default "/")
+	    	root directory used for LSP initialization (default "/")
+	  -rpc.trace
+	    	print the full rpc trace in lsp inspector format
 	  -server value
-	    	language server command for filename match (e.g. '\.go$:gopls')
+	    	map filename to language server command. The format is
+	    	'handlers:cmd' where cmd is the LSP server command and handlers is
+	    	a comma separated list of 'regexp[@lang]'. The regexp matches the
+	    	filename and lang is a language identifier. (e.g. '\.go$:gopls' or
+	    	'go.mod$@go.mod,go.sum$@go.sum,\.go$@go:gopls')
 	  -showconfig
 	    	show configuration values and exit
 	  -v	Verbose output
diff --git a/cmd/acmefocused/main_test.go b/cmd/acmefocused/main_test.go
index f428b66..3c3b094 100644
--- a/cmd/acmefocused/main_test.go
+++ b/cmd/acmefocused/main_test.go
@@ -4,7 +4,7 @@ import (
 	"bytes"
 	"context"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net"
 	"os"
 	"os/exec"
@@ -35,7 +35,7 @@ func TestListenAndServe(t *testing.T) {
 		t.Skip("skipping on windows because unix domain sockets are not supported")
 	}
 
-	dir, err := ioutil.TempDir("", "acmefocused-test")
+	dir, err := os.MkdirTemp("", "acmefocused-test")
 	if err != nil {
 		t.Fatalf("couldn't create temporary directory: %v", err)
 	}
@@ -74,7 +74,7 @@ func TestListenAndServe(t *testing.T) {
 			continue
 		}
 		want := []byte(testWinID + "\n")
-		got, err := ioutil.ReadAll(conn)
+		got, err := io.ReadAll(conn)
 		if err != nil {
 			t.Errorf("read failed: %v", err)
 		}
diff --git a/internal/acme/acme.go b/internal/acme/acme.go
index 32a969d..1756dab 100644
--- a/internal/acme/acme.go
+++ b/internal/acme/acme.go
@@ -11,7 +11,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"os"
 	"path"
@@ -160,7 +159,7 @@ func Windows() ([]WinInfo, error) {
 		return nil, err
 	}
 	defer index.Close()
-	data, err := ioutil.ReadAll(index)
+	data, err := io.ReadAll(index)
 	if err != nil {
 		return nil, err
 	}
@@ -328,7 +327,7 @@ func (w *Win) ReadAll(file string) ([]byte, error) {
 	if err != nil {
 		return nil, err
 	}
-	return ioutil.ReadAll(f)
+	return io.ReadAll(f)
 }
 
 func (w *Win) ID() int {
@@ -782,7 +781,7 @@ type EventHandler interface {
 	Look(arg string) bool
 }
 
-func (w *Win) loadText(e *Event, h EventHandler) {
+func (w *Win) loadText(e *Event, _ EventHandler) {
 	if len(e.Text) == 0 && e.Q0 < e.Q1 {
 		w.Addr("#%d,#%d", e.Q0, e.Q1)
 		data, err := w.ReadAll("xdata")
diff --git a/internal/acmeutil/acme.go b/internal/acmeutil/acme.go
index 1f59527..25c75ad 100644
--- a/internal/acmeutil/acme.go
+++ b/internal/acmeutil/acme.go
@@ -126,3 +126,23 @@ func Hijack(name string) (*Win, error) {
 	}
 	return nil, fmt.Errorf("hijack %q: window not found", name)
 }
+
+// NOTE: maybe remove and use FileReadWriter instead
+type fileWriter func([]byte) (int, error)
+
+func (wr fileWriter) Write(p []byte) (int, error) {
+	return wr(p)
+}
+
+func (w *Win) fileWriter(name string) io.Writer {
+	var writer fileWriter
+	writer = func(p []byte) (n int, err error) {
+		return w.Write(name, p)
+	}
+	return writer
+}
+
+// returns io.Writer attached to this windows "body"
+func (w *Win) BodyWriter() io.Writer {
+	return w.fileWriter("body")
+}
diff --git a/internal/lsp/acmelsp/acmelsp.go b/internal/lsp/acmelsp/acmelsp.go
index 83d6bde..6561593 100644
--- a/internal/lsp/acmelsp/acmelsp.go
+++ b/internal/lsp/acmelsp/acmelsp.go
@@ -6,7 +6,6 @@ import (
 	"context"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"sort"
 	"strconv"
@@ -78,10 +77,17 @@ func getLine(p string, l int) string {
 	return ""
 }
 
-func PrintLocations(w io.Writer, loc []protocol.Location) error {
-	wd, err := os.Getwd()
-	if err != nil {
-		wd = ""
+func PrintLocations(w io.Writer, loc []protocol.Location, wds ...string) error {
+	var wd string
+	if len(wds) == 0 {
+		var err error
+		wd, err = os.Getwd()
+		if err != nil {
+			wd = ""
+		}
+	} else {
+		// workaround to pass "", filepath.Rel then uses absolute paths inside lsp.LocationLink
+		wd = wds[0]
 	}
 	sort.Slice(loc, func(i, j int) bool {
 		a := loc[i]
@@ -192,7 +198,7 @@ func CodeActionAndFormat(ctx context.Context, server FormatServer, doc *protocol
 			if err != nil {
 				return err
 			}
-			b, err := ioutil.ReadAll(rd)
+			b, err := io.ReadAll(rd)
 			if err != nil {
 				return err
 			}
@@ -206,9 +212,6 @@ func CodeActionAndFormat(ctx context.Context, server FormatServer, doc *protocol
 					},
 				},
 			})
-			if err != nil {
-				return err
-			}
 		}
 	}
 	edits, err := server.Formatting(ctx, &protocol.DocumentFormattingParams{
diff --git a/internal/lsp/acmelsp/acmelsp_test.go b/internal/lsp/acmelsp/acmelsp_test.go
index dd837da..92af6f1 100644
--- a/internal/lsp/acmelsp/acmelsp_test.go
+++ b/internal/lsp/acmelsp/acmelsp_test.go
@@ -2,7 +2,7 @@ package acmelsp
 
 import (
 	"flag"
-	"io/ioutil"
+	"io"
 	"reflect"
 	"regexp"
 	"strings"
@@ -112,7 +112,7 @@ func TestParseFlagSet(t *testing.T) {
 	for _, tc := range tt {
 		t.Run(tc.name, func(t *testing.T) {
 			f := flag.NewFlagSet("acme-lsp", flag.ContinueOnError)
-			f.SetOutput(ioutil.Discard)
+			f.SetOutput(io.Discard)
 
 			cfg := config.Default()
 			err := cfg.ParseFlags(config.LangServerFlags, f, tc.args)
diff --git a/internal/lsp/acmelsp/assist.go b/internal/lsp/acmelsp/assist.go
index 8f141e5..0a05cdf 100644
--- a/internal/lsp/acmelsp/assist.go
+++ b/internal/lsp/acmelsp/assist.go
@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"time"
 	"unicode"
@@ -145,7 +144,7 @@ func readLeftRight(id int, q0 int) (left, right rune, err error) {
 		return 0, 0, err
 	}
 
-	b, err := ioutil.ReadAll(w.FileReadWriter("xdata"))
+	b, err := io.ReadAll(w.FileReadWriter("xdata"))
 	if err != nil {
 		return 0, 0, err
 	}
diff --git a/internal/lsp/acmelsp/client_test.go b/internal/lsp/acmelsp/client_test.go
index 5932fed..2fb8ea2 100644
--- a/internal/lsp/acmelsp/client_test.go
+++ b/internal/lsp/acmelsp/client_test.go
@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"context"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"reflect"
@@ -46,18 +45,18 @@ func testGoModule(t *testing.T, server string, src string, f func(t *testing.T,
 	}
 
 	// Create the module
-	dir, err := ioutil.TempDir("", "examplemod")
+	dir, err := os.MkdirTemp("", "examplemod")
 	if err != nil {
 		t.Fatalf("TempDir failed: %v", err)
 	}
 	defer os.RemoveAll(dir)
 
 	gofile := filepath.Join(dir, "main.go")
-	if err := ioutil.WriteFile(gofile, []byte(src), 0644); err != nil {
+	if err := os.WriteFile(gofile, []byte(src), 0644); err != nil {
 		t.Fatalf("WriteFile failed: %v", err)
 	}
 	modfile := filepath.Join(dir, "go.mod")
-	if err := ioutil.WriteFile(modfile, []byte(goMod), 0644); err != nil {
+	if err := os.WriteFile(modfile, []byte(goMod), 0644); err != nil {
 		t.Fatalf("WriteFile failed: %v", err)
 	}
 
@@ -72,7 +71,7 @@ func testGoModule(t *testing.T, server string, src string, f func(t *testing.T,
 	srv, err := execServer(cs, &ClientConfig{
 		Server:        &config.Server{},
 		RootDirectory: dir,
-		DiagWriter:    &mockDiagosticsWriter{ioutil.Discard},
+		DiagWriter:    &mockDiagosticsWriter{io.Discard},
 		Workspaces:    nil,
 	}, false)
 	if err != nil {
@@ -275,18 +274,18 @@ func main() {
 	var s string
 }
 `
-	dir, err := ioutil.TempDir("", "examplemod")
+	dir, err := os.MkdirTemp("", "examplemod")
 	if err != nil {
 		t.Fatalf("TempDir failed: %v", err)
 	}
 	defer os.RemoveAll(dir)
 
 	gofile := filepath.Join(dir, "main.go")
-	if err := ioutil.WriteFile(gofile, []byte(src), 0644); err != nil {
+	if err := os.WriteFile(gofile, []byte(src), 0644); err != nil {
 		t.Fatalf("WriteFile failed: %v", err)
 	}
 	modfile := filepath.Join(dir, "go.mod")
-	if err := ioutil.WriteFile(modfile, []byte(goMod), 0644); err != nil {
+	if err := os.WriteFile(modfile, []byte(goMod), 0644); err != nil {
 		t.Fatalf("WriteFile failed: %v", err)
 	}
 
@@ -349,14 +348,14 @@ if __name__=='__main__':
 `
 
 func testPython(t *testing.T, src string, f func(t *testing.T, c *Client, uri protocol.DocumentURI)) {
-	dir, err := ioutil.TempDir("", "lspexample")
+	dir, err := os.MkdirTemp("", "lspexample")
 	if err != nil {
 		t.Fatalf("TempDir failed: %v", err)
 	}
 	defer os.RemoveAll(dir)
 
 	pyfile := filepath.Join(dir, "main.py")
-	if err := ioutil.WriteFile(pyfile, []byte(src), 0644); err != nil {
+	if err := os.WriteFile(pyfile, []byte(src), 0644); err != nil {
 		t.Fatalf("WriteFile failed: %v", err)
 	}
 
@@ -367,7 +366,7 @@ func testPython(t *testing.T, src string, f func(t *testing.T, c *Client, uri pr
 	srv, err := execServer(cs, &ClientConfig{
 		Server:        &config.Server{},
 		RootDirectory: dir,
-		DiagWriter:    &mockDiagosticsWriter{ioutil.Discard},
+		DiagWriter:    &mockDiagosticsWriter{io.Discard},
 		Workspaces:    nil,
 	}, false)
 	if err != nil {
diff --git a/internal/lsp/acmelsp/config/config.go b/internal/lsp/acmelsp/config/config.go
index bbdb63f..58da2ad 100644
--- a/internal/lsp/acmelsp/config/config.go
+++ b/internal/lsp/acmelsp/config/config.go
@@ -6,7 +6,6 @@ import (
 	"flag"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"runtime"
@@ -211,7 +210,7 @@ func Load() (*Config, error) {
 }
 
 func load(filename string) (*Config, error) {
-	b, err := ioutil.ReadFile(filename)
+	b, err := os.ReadFile(filename)
 	if err != nil {
 		return nil, err
 	}
diff --git a/internal/lsp/acmelsp/exec_test.go b/internal/lsp/acmelsp/exec_test.go
index 55417d7..eead4c8 100644
--- a/internal/lsp/acmelsp/exec_test.go
+++ b/internal/lsp/acmelsp/exec_test.go
@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"runtime"
@@ -62,7 +61,7 @@ func TestServerSetWorkspaces(t *testing.T) {
 			},
 		},
 	}
-	ss, err := NewServerSet(cfg, &mockDiagosticsWriter{ioutil.Discard})
+	ss, err := NewServerSet(cfg, &mockDiagosticsWriter{io.Discard})
 	if err != nil {
 		t.Fatalf("failed to create server set: %v", err)
 	}
diff --git a/internal/lsp/acmelsp/remote.go b/internal/lsp/acmelsp/remote.go
index 7125ff7..e7877ba 100644
--- a/internal/lsp/acmelsp/remote.go
+++ b/internal/lsp/acmelsp/remote.go
@@ -216,7 +216,7 @@ func (rc *RemoteCmd) Implementation(ctx context.Context, print bool) error {
 	return PrintLocations(rc.Stdout, loc)
 }
 
-func (rc *RemoteCmd) References(ctx context.Context) error {
+func (rc *RemoteCmd) References(ctx context.Context, showReferences bool) error {
 	pos, _, err := rc.getPosition()
 	if err != nil {
 		return err
@@ -234,6 +234,22 @@ func (rc *RemoteCmd) References(ctx context.Context) error {
 		fmt.Fprintf(rc.Stderr, "No references found.\n")
 		return nil
 	}
+
+	if showReferences {
+		cw, err := acmeutil.Hijack("/LSP/References")
+		if err != nil {
+			cw, err = acmeutil.NewWin()
+			if err != nil {
+				return err
+			}
+
+			cw.Name("/LSP/References")
+		}
+		defer cw.Win.Ctl("clean")
+
+		cw.Clear()
+		return PrintLocations(cw.BodyWriter(), loc, "") // NOTE: uses absolute paths
+	}
 	return PrintLocations(rc.Stdout, loc)
 }