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 :/

[256shadesofgrey]

In case anyone is interested, I found a solution which I have documented here: https://github.com/256shadesofgrey/hgl-multilaunch

All the other approaches I found while searching for a solution were either not applicable (i.e. specific to steam) or caused one of 2 problems:

1. The game ran only after the trainer was stopped, which defeated the purpose of this exercise.
2. The game's DRM/login put me on a black screen and I couldn't actually play the game.

This approach solves both issues.