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Virtual Null-Modem Software allows to emulate virtual serial port pairs connected by virtual RS232 null modem cable. Typically one port of the combine is utilized by Windows application that requires a COM port to speak with a gadget and other port is utilized by gadget imitating program.

Virtual RS232 null modem is a specialized technique to interface two PC applications straightforwardly utilizing a virtual serial port. Not at all like an null modem cable, a virtual null modem modem is a product arrangement which copies an equipment invalid modem inside the PC. All highlights of an equipment invalid modem are accessible in a virtual invalid modem also. There are a few preferences to this:

Higher transmission speed of serial information, constrained just by PC execution and system speed
Virtual associations over neighborhood system or Internet, alleviating link length confinements
Essentially boundless number of virtual associations
No requirement for a serial link
The PC's physical serial ports stay free
For example, DOSBox has permitted more established DOS recreations to utilize virtual invalid modems.
Another regular illustration comprises of Unix pseudoterminals (pty) which exhibit a standard tty interface to client applications, including virtual serial controls. Two such ptys may effortlessly be connected together by an application to shape a virtual invalid modem correspondence way.