wanted - wifi wireless api or methods for controlling external wireless adsl router

Question

Hello all. I have been trying to find an api that works with external (not card) devices so that the C# application works with all types of product, eg all-in-one wifi/adsl/router such as Dlink dsl-g604t.

A hotspot owner would like to:
a) (preferably) identify the ssid of each new operative, and
b) have the software enable or disable the new operative access.

There is a program which does something similar which probably works on discovering incoming IP address its called mywifizone, and this seems to be the only product which works with almost every form of wifi equipment.

I have been searching this problem for a while without fruition. Tried a known commercial delphi/c/c# product called 'advanced wifi manager' which seems pretty good for cards but not external devices as above.
Kind regards,
Alistair.