[expert] sub domain

[xylonite]

hi all..

how do i make a sub domain like
if my domain is abc.com

user1.abc.com
user2.abc.com
user3.abc.com....

thanks
fay
bc # {F5131C24-E56D-51CF-B78A-888553580000}
mail main at : [EMAIL PROTECTED]
web f51.w3.to
linux project LinuxMelayu.w3.to
web mail f51.i-p.com
icq #781787