If a terminalserver 2008 R1 is configured for only one session per user nevertheless it is possible to start more than one instance of a RemoteApp within one connecting computer. If a second computer starts the RemoteApp with the same credentials, the first RemoteApp-Session is closed, like it should be...

a) Is the first described behaviour a bug or a feature?

b) Is it possible to reconfigure terminalservices to change that behaviour?

c) The application prevents a second instance of herself by querying the mutex of all running processes within the user. If she finds a process with the same mutex as herself, she closes immediately. This works perfect within a real console session as well as a 'normal' terminalsession. Only if started as RemoteApp the application always thinks that she is running the first time and alone... What do we have to change in program-code regarding the mutex query?