dd> Although I have not checked to see if it works with the
 dd> virtual modem in DOSBox; but it works fine with the
 dd> NetSerial virtual modem.

I can confirm that Terminate (and probably others) works ok with the DOSBox 
0.74 virtual modem. Just put something like:

=============================
[serial]
serial2=modem listenport:5002
=============================

in "dosbox.conf".

Works for me.

 * Origin:  (1:3634/12)