limiting number of instances in Windows terminal server

[imadam]

Hello,
I can read a little of German, but to write, not possible. So here is my question in English:
I have Delphi app which need to execute in Windows Terminal Server (nowdays RDS). We would like to be able to control how many instances user can run in their session. So for example:
- user 1 can run two instances of app 1
- user 2 can run 1 instance of app 1

We are able to fix this on Windows to have only one instance of application running but on TS is a bit problem for us. Anybody had similar problem?

Thank you.