How to excute a script when PortableApps start and stop

Dear All,

I would like to start a script when PortableApps start and another when Portableapps is closed

No matter if the usb key is removed without a clean close of PortableApps.

Example
At start time
execute "rundll32 OpenXX.dll DllRegisterServer"
At close time
rundll32 OpenXX.dll DllUnregisterServer

Thanks for your help

Jacobo