What is the command to force a mac to reboot using mac os original version?

What is the General Mac OS command to force a Mac to use restart (on the internet) is the original version of Mac OS (it has been bundled with)?  I am told that it is by a non-Apple technician.

For a Mac that shipped with 10.7 or newer, Option, command, and R.

For a Mac comes with an earlier version of Mac OS X, it is not a. These Macs require a DVD (or thumbdrive for MacBook Air) to reload the original OS.

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Tags: Mac OS & System Software

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