What is Null-modem? Why it is used?

Subject Peripheral and Interfacing
NU Year Set: 4.(d) Marks: 1+3=4 Year: 2017

A null modem cable allows you to connect your PC to another nearby PC or serial device using its modem protocol. A popular use of null modem cables is for setting up "head-to-head" gaming between two players at different computers in the same room. (A null modem cable is limited to 30 feet in length.)

A virtual null modem is a communication method to connect two computer applications directly using a virtual serial port. Unlike a null modem cable, a virtual null modem is a software solution which emulates a hardware null modem within the computer. ... The computer's physical serial ports remain free.

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