Close Application Program and save my document

I want to close all running Windows's Application program and save the document which can be named or unnamed such as WORD document,wordpro document,Notepad document...
in my program.Also I want to do the same for DOS Application program.
How can I do?

Hey,
You need to use the function Serialize(CArchive &ar).
this function called my windows when the user click at the 'save' button.