How to run multiple executables at the same time in the same prefix?

[256shadesofgrey]

In steamtinkerlaunch in the game menu it is possible to select a "fork custom command" option, and the custom command that is entered will be executed alongside the game. This is how I get trainers to run with my steam games. Is something like that possible with the HGL?

I tried adding the trainer as a separate game with the same prefix, but that way whichever application was started 2nd does not start until the 1st is stopped.

In particular I have Shadow of the Tomb Raider on EGS, and it does not run if add it as a non-steam game to steam (from what I could gather based on the comments of people who had the same issue on windows, it's some kind of DRM/connection issue), so I can't use steamtinkerlaunch to run it like that. It does work with HGL though, but I don't know how to get a trainer to work with it.

[Milor123]

Anyone here? Have the same problem :/