Get Focus Lose Focus (ASAP)

Hello I have a program that Gets the focus of a text box on intervals and need to "reset" the focus to the application that had the focus before i took it.


For an example:
I am useing internet explorer and the application gets the focus of the text box in my application then i want to "reset" the focus back to internet explorer !

ANY HELP WANTED AND NEEDED

Lets say that Calculator is running...

Code:

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AppActivate "Calculator"

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I Was looking for some code that will GET THE LAST APP AND REACTIVATE IT

Does any one no ??

Does ANy one no how to do this !!