gnupic: Thread: Writing a port out to a file in GPSIM

Is there any way to set something similar to a break point where gpsim 
stops, write the contents of say RB0 to a file and then carrys on with the 
simulation until it revisits this point?  I can't see a way to do it from 
the manual as breakpoints require manual interations.  I suppose I could 
write a kluge with expect if there was no other way.

Pete