From one Mark to another, I think you are stacking the odds pretty high that you will have to look it up. Just kidding. Do we get like three guesses?
From dictionary.com, I believe I have definitively identified "this" http://dictionary.reference.com/browse/this
This discussion reminds me that I sometimes send mail without the attachments. That stupid computer cannot read my mind (maybe better though....)
I also have a brother named Mark. If Pete has a brother named Mark and I have a brother named Mark then that only can mean....... Pete and I are brothers!!!! Hey brother Pete, have you seen Mark lately?