WHERE TO FIND REGISTRY KEY FOR WINDOWS EXPLORER CONTEXT MENU INTEGRATION OF USER DEFINED CHOICES IN BLANK SPACE?

WELL, I HAVE A QUESTION ABOUT CREATING MY OWN COMMANDS IN WINDOWS EXPLORER CONTXT MENUS.

UNTILL NOW, I SUCCESSFULLY LEARND HOW TO MAKE MY OWN OPTIONS IN WINDOWS EXPLORER CONTEXT MENUS FOR FILES AND FOLDERS.

USING REGISTRY, I JUST GO TO MY COMPUTER\HKEY_CLASSES_ROOT\FOLDER (FOR FOLDERS) OR TO MY COMPUTER\HKEY_CLASSES_ROOT\* (FOR FILES) AND I MAKE A NEW REGISTRY KEY WITH ITS OWN COMMAND KEY AND DEFAULT STRING VALUE. AND COMMAND IS CREATED, AND I CAN USE MY OWN PROGRAM FOR HANDLING FOLDERS AND FILES.

BUT, THIS ONLY GOES FOR FILES AND FOLDERS.

HOWEVER,  I ALSO WANT TO BE ABLE TO ADD MY OWN COMMANDS IN "BLANK SPACE" CONTEXT MENU.

WHAT I MEAN IS, I WANT TO ADD MY OWN OPTION IN CONTEXT MENU WHEN I CLICK ON THE EMPTY SPACE. USUALLY WHEN I CLICK ON EMPTY SPACE, A MENU IS OPENED WITH OPTIONS LIKE: VIEW, ARRANGE ICONS BY, REFRESH, AND SO ON. I NOTICED THAT SOME PROGRAMS I INSTALLED MADE THEIR OWN CHOICES IN THAT MENU, SO I KNOW THAT IT IS POSSIBLE. SO I WANT TO MAKE MY OWN OPTION, SO WHEN I RIGHT CLCK ON EMPTY SPACE, AND WHEN MENU APPEARS, THAT I HAVE MY OPTION THERE.

SO DOES ANYONE KNOW HOW?

CAN YOU GIVE ME AN REGISTRY ADDRESS FOR THOSE KIND OF MENUS MENUS? (EMPTY SPACE MENUS)

OR IF NO, IS THERE ANY OTHER WAY?

THANK YOU FOR YOUR TIME. ;)