programs starting at log in

[Roger Searle]

Hi, I thought this would be an easy thing to find in google but it 
appears I don't know the right thing to ask.  I want to stop some 
programmes loading when I log on to my suse 9.3 machine, specifically 
kopete and an instance of skype (which is starting up twice, once on an 
old account name and also on my current account - the latter one I want 
to continue to start up). 

I have found plenty of info on runlevels and looked around in Yast but 
am no clearer on how to achieve this - can someone point me in the right 
direction?

Cheers,
Roger