JdeBP> "Maintaining" task IDs isn't necessary, since the
operating system
 JdeBP> does that for you.

 ml> it does?? since when does MS/PC/DR/4/etc-DOS do that??

 Since PC-DOS version 2, which has "program segment prefixes".  The PSP
 number on a DOS system is unique to a single process at any single time.
 So a DOS implementation of the scheme would use a  tuple.

 If I remember correctly (and it has been a long time) the getpid() call
 in most DOS C++ compilers' standard libraries will return the PSP.  So
 the code wouldn't be very different from a UNIX or OS/2 implementation
 using a  tuple.

 / JdeBP .

... Another excellent OS/2 day goes by.
--- Blue Wave/OS2 v2.20 [NR]