Where or how does SuSE KDE set certain permissions correctly ?

Hi there, if you use KDE from SuSE it correctly sets certain permissions like /dev/dsp if you logon. Now I installed KDE 3.1 on my own, if I logon as user "test" the permissions for /dev/dsp still belong to "malte_gell". If I use SuSE's KDE it always sets the permissions correctly for the user who logs on. Which way does SuSE use to set those permissions ? I'd like to use this for my self compile KDE 3.1. Thanx Malte