BE>
  > what I want to do is to work on a Door Program that will inherit the
  > open port handle.  I would like to know how to use that open comm
  > handle.
BE>

  DosRead and DosWrite, just like any other file handle.  Category 1
  DosDevIOCtl to do things like setting the BPS rate and so forth.

BE>
  >         Or I would like to know if I use the DosOpen and start up and
  > program trying to grab that comm port will it have problems if the BBS has
  > (if that made sense)
BE>

  DosOpen may or may not succeed, depending from the sharing mode that the
  BBS program used when *it* opened the COM device.  It it used "deny
  all", then you will not be allowed to open the COM device via DosOpen.

  However, that is definitely the *wrong* way to do things.  If the BBS
  program passes you a COM device handle, then USE IT.  There's no sense
  in faffing around opening the COM device yourself when you've been given
  a device handle to use already.

  And in the long term, your door program then doesn't have trouble when
  one day someone decides to install it on a LAN, where the COM device is
  called \\SERVER2\MODEM3 .

  > JdeBP <
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