Data subsystem

Management Information Systems (MIS) are made up of a series of subsystems. Each subsystem is designed to handle the data produced by different components of the MIS.

yes

a computer on the whole is a system ... it has a lot of subsystems .. these subsystems are said to be the computer subsystem ... thus in simple words , a subsystem found in a computer system is said to be a "Computer Subsystem"

check this out the follwing link for your answer

http://www.slideshare.net/arunjimishra/mis-subsystems#btnLast