Answer: operatingsystem

AnswerCrossword Clue
OPERATINGSYSTEMComputer's "brain"
OPERATINGSYSTEMWindows, for example
OPERATINGSYSTEMUnix, for one
OPERATINGSYSTEMWindows, for one
OPERATINGSYSTEMMicrosoft Windows, for one
OPERATINGSYSTEMWindows or Unix
OPERATINGSYSTEMHardware manager
OPERATINGSYSTEMSurgeons M.O.?