Localizor

Vibration

Fingerprint scanner

You can never have enough greasy finger prints on a surface

Touch

Hardware

Code signing

I put an OS in your OS, etc.

Virtualization

System recovery

File encryption

Allow the user to interact with the operating system in any number of ways

Plug'n'Play

User accounts

Let your users pretend they can multitask by having several applications open at any one time

Multitasking

System

The Operating System is the largest piece of software in Software Inc. Most software needs an Operating System to run on. When people stop buying a line of Operating Systems, they will also stop buying software for them.

Operating System

Default

Gate