AlarIT Virtual Serial Driver (AVSD) 

AVSD is appointed for emulation of one, two or more (up to 200) serial streams. Hardware devices are not necessary. This product is based on Windows XP DDK and doesn't require using devices of other manufacturers.
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Multicom 

Multicom is appointed for emulation of one, two or more serial streams. Hardware devices are not necessary. This product is based on Windows XP DDK and doesn't require using devices of other manufacturers.
virual serial ports driver com ports serial streams windows xp ddk virtual ports fake serial ports driver virtual ports serial vspd virtual com driver emulation serial streams full emulation

AVSD 

AVSD is appointed for emulation of one, two or more (up to 200) serial streams. Hardware devices are not necessary. This product is based on Windows XP DDK and doesn't require using devices of other manufacturers.
virual serial ports driver com ports serial streams windows xp ddk virtual ports fake serial ports driver virtual ports serial vspd virtual com driver emulation serial streams full emulation