Not able to communicate between Windows Server Process and TeamCity Build

Hi,

currently I am trying to use TeamCity to deploy an Steam Workshop addon automatically.

The problem is, that my build stops with errors because it cannot find an active instance of Steam although it is started under the same user that runs the agent.

I am using Windows Server 2012 with Teamcity Agent started as service (again, same user who started Steam application via RDP).

Is there a chance to get Teamcity to communicate with the running processes or is it impossible to do this?

Best regards,

seschi