xrdp only one session and everytime connecto to same

[n4p]

Hi,
its my first post here and i hope in the right forum. I am a fresh centos user and have worked before with debian/ubuntu.
What i wanna do is to start xrdp with only one session, i need to run there an application where different people can connect using rdp from windows 7/10.

What i've got now is that xrdp work as descripted but it starts everytime a new session if i use a new computer or a different laptop.

What i want to have is that every user get's one the same desktop/session.

I just googeld a bit and found the idea with the fixed port, but that won't work.

Thanks for your help!
Kind regards

[n4p]

Nobody got an Idea how to fix that?
If i set it to an static port it won't work

Is it possible to set it to the display:0 ?