My software needs to detect if it's running on a windows server

I would like ti disable a license check routine if I can determine the software is being run from a server operating system, for example Citrix

Is there a way to detect this in Powerbuilder 12.5

I have been researching the windows functions but remember by PB app is 32 bit and most likely running under a 64 bit server, not sure if I can make operating system function calls

Thanks

Richard