How to find out that a chained bundle requested a restart?

[cd-dev-ge]

Hi everyone,
we use a bundle installer with Wix toolset v3. Now we install lots of msis and exes along with our own one. One of those exe installers is a bundle installer too.

That one may or may not request a reboot. That led to reboots during our own installation routine interrupting it. Therefore we want to suppress the reboot from that third-party installer and do it at the end of our bundle install. Unfortunately we cannot find a way how to find out if the third-party installer needs us to perform a reboot or not.

Is there a way to check this?

Best regards.