Firstly, your hardware must support the power-off operation which means having a suitable PSU and the function suitably enabled in the BIOS.

Secondly, you need an operating system that supports powering off and is configured to allow that.

Thirdly, you need to issue that appropriate command. This is usually the 'init' command with the correct init level (depending on O/S) which for SCO, as far as I remember, is:

Code:

# init 0

(means shutdown the O/S)

Code:

# init 6

(means reboot the O/S)

Code:

# init 5

(means shutdown and power off)

Code:

# init n

(means change to runlevel 'n')

So whether it will work or not depends on a number of things. All you can do is try it and see what happens.