An operating system is a collection (or suite) of programs that manages and controls the computer. Operating systems have many functions: A user interface is a program, or suite of programs that ...

Charles Kalko is a big fan of trusted operating systems. With PitBull from Argus Systems Group Inc., he’s used them to lock down vital functions that run his business-to-business barter site.

Standard operating system (OS) methods for alerts and messages can often be more accessible than something custom made, in particular for users of assistive technology.