Multi-Tech Systems MT5600BL - Manual (Page 90)

MultiModemII User Guide
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Fax and Data Software Can’t Run at the Same Time
4 Communication devices can be accessed by only one application at a time. Under
DOS or Windows 3.1x, you can run either your fax software or your datacomm
software, but not both at the same time, unless you have a special communication
device management application. In Windows 95, 98, and NT 4.0, you can have data
and fax communication applications open at the same time, but they cannot use
the same modem at the same time.