Correction to DLW's addendum on system 78.

[David L. Andre <DLA at MIT-AI>]

    Date: 12 December 1981 12:44-EST
    From: Daniel L. Weinreb <dlw at MIT-AI>

    Only one process is permitted to be running the compiler at a time.  It
    used to be that if you tried to run the compiler in two processes at
    once, you got strange and mysterious errors; now the second process
    waits for the first one to finish.  It waits in process state "Lock",
    which you may see in the who-line if this happens to you.
Actually the process state is "Compiler".  If you get "Lock", something
else is locked.  This problem may be totally circumvented shortly.