*** There are difficulties with subprocesses, though, due to problems<BR>
in Windows, beyond the control of Emacs.  They work fine as long as
you run Windows applications.  The problems arise when you run a DOS
application in a subprocesses.  Since current shells run as DOS
applications, these problems are significant.
<P>
If you run a DOS application in a subprocess, then the application is
likely to busy-wait, which means that your machine will be 100% busy.
However, if you don't mind the temporary heavy load, the subprocess
will work OK as long as you tell it to terminate before you start any
other DOS application as a subprocess.
<P>
Emacs is unable to terminate or interrupt a DOS subprocess.
You have to do this by providing input directly to the subprocess.
<P>
If you run two DOS applications at the same time in two separate
subprocesses, even if one of them is asynchronous, you will probably
have to reboot your machine--until then, it will remain 100% busy.
Windows simply does not cope when one Windows process tries to run two
separate DOS subprocesses.  Typing CTL-ALT-DEL and then choosing
Shutdown seems to work although it may take a few minutes.
<P>