This should go to comp.lang.ada, but it seems my news connection is down.

Long time ago, I read about a program, I think it was in Ada, that NASA
was using to schedule experiments on the space shuttle.  It had some GUI
capabilities.  Users would identify what pieces of equipment they needed
for an experiment, and the tool would reserve a time slot when all the
pieces were available.

I am trying to locate info on that or a similar tool, preferably with
source, and preferably in Ada and/or TCL/wish.  It has been so long that I
can't remember exact words for a more effective Web search.  Maybe it
wasn't even NASA.