Firstly,thanks for your replies.
If I write a program using MFC or API and I need to set my program become a background mode running application,how I carry out it?

Firstly,thanks for your replies.
If i write a program using MFC or API and i need to set my program become a background mode running application,how i carry out it?

Programming is hardly a Beginners question so you might try posting this in the Programming topic.

You might want to explain the purpose of your app. As I said, with a multi-tasking OS, there is really no need to write something to "work in the background". As long as its loaded into memory it should continue to run.