I wrote:

> Clearly, I have (yet more) reading to do.  (First stop:  find out
> what the heck a "dependency semaphore" [DSEM] is.)

then Ken Sletten:

> I refer Glenn and all who are interested to pages 10-8 and
> 10-9 of the August 1997 Sixth Edition of the TurboIMAGE/XL
> DBMS Reference Manual.  It has a very nice two-page
> description of DSEM.

Ah, so I'm only 1.5 years behind on my reading -- I'm getting better! ;)

Many thanks for the "Executive Summary" of DSEM!
Will check out the details (online, of course :) by Monday!

So much to learn; so few brain cells to "absorb" it. ;)

--Glenn