Thanks for moving my post, I got that using the "exclude" is okay here.
As I got part of the answer outside this forum I would like to post it here:
The INCLUDE also works !!
For example
http://www.flyertalk.com/forum/search.php?do=getdaily&include=386
http://www.flyertalk.com/forum/searc...ly&include=386
only checks for new posts in the Technical Issues forum. You can compile a short list of your own forums to check.