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directing control after program interruption

hello IDL power users:  i have a long minimization process running under
IDL.  i would like the user to be able to interrupt the process at any
time.  once the user interrupts by typing ctrl-c, i would like to direct
program control to a different part of the routine.  the only way i know
to resume the program run is the .continue executive command, but that
just continues on with the next statement, whereas i would like to branch 
to the end of the routine.  is there a system variable that is set when a
user interrupts program flow?  or does this fall into exception handling?

thank you in advance!

david mattes