Lock keyboard & mouse

[Peter Jaspers-Fayer]

Is there a program that puts up a screen or window and password locks
the mouse & keyboard?  I am new to the Iris world, and I'm  not much
of a C programmer.  What I'd like to do is when I'll be away for a
while, I'd like to call up this program that displays a full-screen
window that is not close or push-able, securely locking out the screen
until a password is entered on the keyboard.  I want this because:

a) It takes a long time to logout and login again, just to make your
   machine secure while going to the washroom or something, and
b) How do you keep people from fiddling with your machine when running
   long-running graphics applications while you are away?

/PJ                                                SofPJF at VM.UoGuelph.Ca
(Probably also reachable (until ?) at             SOFPJF at UOGUELPH.BITNET)
Never test for an error condition you don't know how to handle.