Terminal Server Client - Net Busy

Hi, :) Has there been any changes to this program or libs that would affect the net usage? Before the net was always busy transmitting back and forth screen info when connected to Win XP Pro. Today I noticed that when client activity stop the net activity stopped. This is, of course, great as I can leave it up with out having gazillions of bytes transmitted each day (if it would even stay connected for a day). Thanks in advance as I'm on the summary and not the threads reply. Scratching head curious :) SJ