Preventing applications from stealing focus

I just found a great Windows tip. I was dreaming about something like for a long time!
Here is where I found it.

Preventing Applications from Stealing the Focus

To prevent applications from stealing the focus from the window you are working

1. Start Regedit

2. Go to HKEY_CURRENT_USER \ Control Panel \ Desktop

3. Edit the key ForegroundLockTimeout

4. Give it a value of 00030d40