I have users that require access to different GW Messengers 1.0.4 deployed
in different network trees.

The problem is that the user can be logged either in one or the other
system. Not both at the same time.
In Linux, I don't have this problem because I can run more than one
instance of the client. Unfortunately, most users are still using Windows

Does anyone know a solution for this?

Thank you in advance.