WLAN Channel and SSID Best Practices

Hello,

Recently I ran into some interesting problems on a wireless network my company installed. The problems I encountered prompted me to do some research on WLAN best practices. However, there are several areas on which I am still unclear.

SSID – If the WAPs all tie into the same subnet, should the SSID be varied? I’ve seen problems encountered with clients roaming between APs, and some suggest that having different SSIDs between access points helps to resolve that issue

Channel – Should the channel between neighboring APs be varied? The argument is that varying the channel decreases interference between adjacent APs. Is there any truth to that?

I appreciate any and all feedback.