Re: LOOKING for IBM BASIC (dos) Compiler manual OR Microsoft (dos) Basic (PSD) V7.x Language Reference manual(s) willing to buy, rent whatever

> Of course, the section of the IBM manual that details the "Cannot
> execute as Chld of Basic" is very im****tant to help me locate the
> cause of the error.!

The error occurs because a process busy flag is set wrong in low memory.
When you use SHELL, the flag is set to let BASIC know that it's already 
executing
a child process and it can only execute one of those at a time.  If you
try 
to execute
a SHELL from the SHELLed process, it checks the flag, sees it set and 
refuses to
run, giving that error message.  Of course, if some errant software sets
the 
flag
without BASIC's knowledge, BASIC will assume it's a child process even 
though
it's not.  The trick, therefore, is to create a batch file that resets the

flag then runs
BASIC.  The magic location is &H50F.  If that location has a 2 in it,
BASIC
won't run.

Tom Lake