Unfortunately no error code tells ms if the line is busy.
In the 4.0 SDK documentation (around page 1260) you can find:
You're assuming that the error codes are all described and that the
descriptions are all accurate. :-) I would encourage you to try
opening Netlib when the line is busy and see what happens.
Is there another function I can use?
Not that I'm aware of.
Regards,
Steve Mann
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