It's not clear to me as what you mean by wifi solution. WiFi is a radio technology that provides wireless connectivity between mobile devices and Internet. Showing a web page is irrelevant to Wifi. Through wifi you only gain the connectivity. These are the applications that are responsible for web page generation and will then allow them to communicate over the air interface. Once the device has found and connected to an access point and all the security credentials are done the rest if up to applications as what to do next.
I don't see any relevance between this interface and the applications. You are basically talking about 2nd layer of the protocol stack and trying to explain something that is related to the 7th layer.
You might either look into mobile webcasting stuff, or you should provide connectivity and then think of the application level technologies that support wireless connectivity (may be Java tech for wireless industry compliant apps). Any kernel that run on such devices i.e. j2ME or Symbian core, etc can communicate with web service access point or hot stops and web pages can be transmitted.
the other thing would be to broadcast you own messages and once connection is done with hot spot to command further browsering, the latter would be totally against either of .11a, b, or g altogether :)