RegisterInterest:
PROC [startDebugging, stopDebugging: InterestProc, data:
REF];
Hack: call this to find out when the debugger is getting called for a Mesa uncaught error. The idea is you'll be able to do keyboard fixups etc. prior to going into the debugger which expects TTY style interaction.
Warning: call this and you'll forevermore be called whenever the debugger is entered (there's no way to undo the registration).