Preventing shares from getting disconnected

[Michel]

This may not be completely samba-related, but chances are someone
here might know:

when a connected share isn't used for a while, appearantly it
gets disconnected (Windows95 explorer won't show this, but running
a "net use" command will). Usually this isn't a problem, but sometimes
some applications barf on this. 

Is there a way to prevent shares from getting disconnected, in spite
of timeouts?

Michel.