2 users use X simultaneously

["Ody" <ody inf its-sby edu>]

hi all,
I'd like to know if RH9 could has 2 users or more using X together but none
one of them have to logout, U know like 'switch user' in windowsXP..for
example :
I'm using Mozilla while my bro is using xpdf.
Please tell me how.
thanks


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Ody