Full list of features

General
Allows splitting physical COM port to several virtual COM ports
Allows sharing physical COM port among several applications
Allows joining several physical COM ports to one virtual COM port
Read/write permissions for COM ports
Signal control COM port for serial signals handling
Fixed serial settings for COM ports
Full hardware serial ports emulation
Virtual serial ports look and work like real hardware ports
Unlimited number of virtual COM ports can be created
Once created virtual ports are operable at each system startup (prior to user login)
Overlapped virtual COM ports support (virtual serial ports can have the same names as existing physical COM ports)
Compatibility
64bit and 32bit compatible
Full Microsoft serial.sys compatibility
PnP and WMI technologies compatibility
Hyper-Threading Technology compatibility
VMware compatibility
User Interface and API
User-friendly program interface
Hot virtual COM port creation. No reboot is required.
Virtual serial ports are controlled directly from your own application using command-line
Virtual serial ports are controlled directly from your own application using Dynamic Link Library (OEM license)
Virtual serial ports are controlled directly from your own application using ActiveX control (OEM license)