Here comes the procedure to reproduce a severe bug in the windows xp terminal
service (RDPDD.dll):

Set up a windows xp pro host and connect then from a remote computer via
remote desktop.

1)
connect and logon (create new session) at color depth 15bit

2)
disconnect (leave the user logged on)

3)
connect and logon to the created session at color depth 16bit

4)
disconnect

5)
connect and logon to the created sesseion at color despth 15bit

-> voila, the remote desktop host system reboots!

- I can reproduce this bug on all 4 availble computers (all xp pro with sp3)
at my location. -