I've been having increasing lagging problems when I use my RDC to access my remote server. After reading scores of posts, it look like I may be disconnecting incorrectly and possibly leaving sessions running. When I re-log in, I may be opening another session.
I typed in the qwinsta and got this:
SESSIONNAME ID STATE TYPE
0 Disc Disc rdpwd
rdp-tcp 65536 Listen rpdwd
console 2 Conn rpdwd
rdp-tcp#103 1 Active rpdwd
>rdp-tcp#102 4 Active rpdwd
I tried qwinsta RESET SESSION 
but got an error message. I looked in Task Manager under users to end session but there was only 1 session showing. I was afraid to end it...
THANK YOU for any help!! This has been a problem for - get this: 10 months!