start application when GUI starts ...
 

I created a small GUI app that I want to popup whenever anyone logs into runlevel 5 (GUI). Please help me configure this. I am running SimplyMepis (Debian Based) with KDE and TWM. I figure there is somewhere where I just open a text file and add:

myprogram &

But, I am at a loss as to what config file it is...

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P686 2.6 GHZ 512MB Ram -
ATI All-in-Wonder AGP 16MB
40GB HDD- 16x CDRW DVDRom
HP PSC 1210 printer

I guess: /opt/kde/share/autostart