Sentence:  You must be somewhere completely different. I've looked for several days and don't see you. But: I'm kind of blind from time to time - please feel free to <WSD>highlight</WSD> me ([Sno]) or probably (H. Merijn Brand) Tux or vanHoesel (Theo van Hoesel). 
Meaning of the word marked with <WSD> tags:  To seek the attention of (a user) on IRC by mentioning their name in a message, causing that message to appear highlighted on their screen.