Help - Blind Scan — Video Satellite Forum — DVD MP3 AVI MP4 players codecs conversion help

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One of the options when doing a BLIND SCAN on my
receiver is the option NETWORK SCAN or NIT ON or OFF.

Just what is a network scan, and should it be on or off?

Also, do most of you fellows scan for ALL or just FREE
when doing a blind scan?

THanks,