is there anyway to for me to allow another user to login same time as me

[Mustafa Abbasi]

i have one computer for the entire family.
i am continously working either downloading or something else. thing which 
do not recive logginf out well.
i was wondering if my parents could login without me logging out and my 
procceses stopping.
you know like in windows xp.
don't think i am trying to copy windows and bash me please.
this would essentially solve many probs 
and prevent my parent from destroying the computer by giving them less 
powers.
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