Security from others when server running

[JakeCatfox@aol.com]

Hi, I'm running a server in a public location, and the applications running 
on the server run in their own virtual console (or an xterm window). However, 
if someone came up and closed the xterm or hit ^C they could cancel the 
server operation, which risks data loss, server failure, etc., and they would 
also have full access to every aspect of the user account the server is run 
on.

Is there a good way to keep others from messing with the server?

Thanks,
Deven G.