where to put pon ???!!

[Dave Selby <dave_arahan@yahoo.co.uk>]

Ive configured my pppd as dial on demand, it works great !!!
Where do I put pon ? I want it to automatically be executed as I boot the 
system.

Ive tried /etc/profile
Works great for bash, but boot KDE and it ain't on

Ive tried ~/.kde/Autostart
Works great for KDE, but if I ctrl-alt-f1 into bash, I have to execute pon

If I put it in both I end up with two pppd's running
I need and equivalent of red hats 
/etc/rc.d/rc.local

Executes one time at system initialise
any ideas ?
Dave