Ah - quite close.
Well - I guess we all learned to our cost occasionally.
At least this laptop was not too expensive.
This is a strange keyboard to my eyes, never seen it before.
Not sure if a USB num pad will do the trick with this laptop model. Try to verify before your investment.
EDIT: you may want to try this first:
http://www.highrez.co.uk/downloads/X...tonControl.htm
It's a special driver for your mouse and capable to simulate keystrokes.
You could create a second layer activated with i.e. ALT and hit a mouse key to send the DEL key stroke of the num pad to SH3 toggling the interface on/off.