Normally there is only one OS installed at a time.
One original OS only for one computer
Usually it is installed on your HDD (Hard Disk Drive).
None. Mac OS X can only be installed on an Apple () computer.
What installed on a computer which determine how data is processed
If you have os x lion for mac
No. The printing capabilities are accessed on a computer by installing a standard OS (Operating System). Usually this feature is included in the purchase of a computer because the OS is pre-installed.
Dual Boot
Providing the Intel processor is in an Apple Mac computer, and the rest of the computer parts are present too, then Mac OS X can be installed.
It can no longer be purchased unless you get an old used computer with it already installed.
The drive that the OS is installed on
Mac OS X can only legally be installed on computers made by Apple.
1st way: click start button on the right side search for "my computer" and right click on it and click properties.