Question about Standard Menus

[GuangHe Pan]

Those built in application such as Address, Expense, MemoPad etc
no actual code to support standard Cut, Copy, Paste, ... menus.

But in the Tutorials MemoPad, codes are required to support Cut, Copy,...'s
performance.

If I remove the support code from Tutorials MemoPad or my own code like
those built in applicaitons did,  it doesn't work. so I wonder there exists 
some associated header files or settings in those built in applications.

Any idea about this?

Regards,

Guanghe Pan