Using MSN Messanger on a remote desktop connection

All of my office PCs are running M$ Windows and I used to have MSN messenger on my PC. Today I noticed some strange thing while working on my PC remotely. All of a sudden my messenger was displaying the status 'Away'. Then I tried to change the status to online but it was not changing to the status 'Online'. Then I went to my PC and moved the mouse a bit. Guess what ... the status was automatically changed to 'Online'. I don't know whether there is a configuration parameter for this but it seems that it does not respond to the remote mouse and KB.