A scramble, as when small objects are thrown down, to be taken by those who can seize them; a confused struggle.

A state of confusion or disorder; -- prob. variant of mess, but influenced by muss, a scramble.

a state of confusion and disorderliness; "the house was a mess"; "she smoothed the mussiness of the bed"

To disarrange, as clothing; to rumple; -- often used with up; as, the wind mussed up my hair.

make messy or untidy; "the child mussed up my hair"

A term of endearment.

"Multiple Users Same System" is about more than one user using a same computer. By the combination of this project and a virtualization software , and of course proper hardware, different users can use computer system simultaneously.