Full list of features

General
Allows creating virtual serial ports connected via a virtual null-modem cable
Allows creating virtual serial loopback plugs
Full hardware serial ports emulation
Virtual serial ports look and work like real hardware ports
Serial data bitrate (transmission speed) emulation
Different virtual null-modem schemes are available (full, partial, loopback)
Unlimited number of virtual COM port pairs 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)
Real null-modem cables are not required
Real serial ports are not occupied
Virtual communication is more fast and reliable than via a real null-modem cable
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 and removal, without rebooting your computer
One click enable/disable button for all virtual serial ports
Virtual serial ports are controlled directly from your own application using command-line
Virtual serial ports are controlled directly from your own application using ActiveX or Dynamic Link Library (OEM license)