THIS UIC CONTAINS ALL THE FILES NECESSARY TO BUILD THE TERMINAL
LOCK-UP PROGRAM. THE TASK IS CALLED BLP (BLOOPER) FOR LACK OF
A BETTER NAME. IT IS USEFUL WHEN YOU NEED TO LEAVE YOUR TTY
UNATTENDED, AND DON'T WANT TO RISK SOMEONE ABORTING YOUR ACTIVE
TASKS OR HAVING ACCESS TO YOUR PRIVILEDGED TERMINAL.
BLP REQUIRES A ONE CHARACTER CODE WHICH CAN BE A CONTROL CHARACTER
TO BE USED AS YOUR ESCAPE SEQUENCE. ALL TERMINAL INPUT WILL BE
CHECKED BY BLP, AND ONLY THE DESIRED ESCAPE CODE WILL BE ACCEPTED.