envelopes at left side threads

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Smoke Blower
Original poster
SMF Premier Member
Jul 17, 2007
Ogden, Utah
I haven't figured out how or what the envelopes are for at the side of the threads. Every time I post something, the envelope has an arrow over it, but others are blue or shaded red. Where can I go to get an explanation of that?
thanks a bunch I knew I had seen that legend before but couldn't remember where
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