Lock your workstation with a keystroke

Hi there…
I?d like to have a question….about Lock your workstation with a keystroke
I did shortcut and I?ve started it….
rundll32.exe user32.dll,LockWorkStation
where is this information and HOT Key configuration stored in Registry tree..???
I really was not able to find it…..
please help…and email me to gdvic@seznam.cz
yours
Radek Vican