If you need to manage several servers at the same time your screen can get rather cluttered with lots of MSTSC sessions running.
Try using RDCMan, get it here
After install, open it up and File->New and create a group container for your specific servers (say you might have 4 UAT servers so call the group “UAT”).
The simply add each server you need to the group.
Then right click and “Connect to Server” on each server in your group.