Any way to prevent topic from showing on Search tab?

Hello,

My Search tab in the generated chm works fine, but I was curious of something. In my project I have some pop-ups. I don't index these since they are often short definitions or graphics. It would be probably be good if these also didn't come up in the Search. Is there any way to mark a topic so that it does not show in a search similar to omitting it from the Index tab by not adding a keyword?

Thanks,

Kevin