Settings based on user parameter: We have two different guixt.ini files we want to use, depending on which plant the user has set in the WRK parameter in SU3. How can we switch guixt.ini files?
It is not possible to switch guixt.ini files depending on parameter settings, but I assume you want to set the script directories depending on the WRK parameter of the user. This is possible with the "Parameter" option in the "user catalog", e.g.

Parameter.WRK=1000 M1
Parameter.WRK=1004 M2

For details see