NAS features info

[Koenraad Lelong]

Hi,

Is there a document that I consult so I know what to look for if I want 
more than just authentication with radius ?
I would like to buy a wireless accesspoint where I can "time" 
user-access, meaning my users are restricted in time when they can use 
the wireless accesspoint, and force them off-line when their time-window 
closes. Because I don't know how this is managed, I can't decide which 
accesspoint will do what I would like to do.
All such stuff, is that read/managed via snmp ?

Regards,

Koenraad Lelong