How to detect it is a remote session at server side?

[Harshan]

I wonder that if there is a way to detect from with a C# app if it is
being started in a remote session? i.e. someone has connected via remote
desktop or terminal services.
and also Logged out of remote desktop session, indication in C#

[Plater]

Yes. I don't remember offhand exactly though.
I think you can find something in Environment.Get EnvironmentVari ables( )

But I was pretty sure there was some direct like isRemoteSession boolean property somewhere. Cannot seem to find it now though.

EDIT:
Found it:
SystemInformati on.TerminalServ erSession