Rdesktop client and preventing windows logout

Hello,
This question comes as a result of my trials with rdesktop, though it is a bit
not related directly to rdesktop. I hope though that some rdesktop users
might help me.

At the company I use rdesktop client from a Linux machine. I connect
to a Windows
machine with rdesktop. The thing is that  Windows logs out after some half an
hour or so when
there is no windows activity, and I need again to enter use name and password.
This cannot be changed, because this is dictated
by the sysadmins at this comopany. I cannot change this timeout according to my
sysadmin. I also tried from the windows menus to change it, and I could not.

I want somehow to cause windows not to close after this period when
there's no activity.
Is there some way - writing some automatic script which generates some activity
- which can avoid closing the windows after this timeout of half an
hour or so ?

Rgs,
Mark

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