[TowerTalk] Information of Wireless LAN

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Hi Everybody,
I wanna want some information on the following things:
1. Guidelines for choosing Wireless LAN 802.11 Equipment,
2. Is the Refractive Index applicable for light rays same for the RF?
3. How does Direct Sequence Spread Spectrum (DSSS) work?
I have just started getting trained for HAM and wireless networks, so i would be posting lots of
questions.
Friends Please  Help ME!!!
Regards,
YA