ministumbler will not run on the 820. at best, it's highly unlikely, you can try it though. i don't know any 2.11 wifi scanner but maybe your card's config app will give you enough information about ssid etc.
you can get only jdk 1.1.x
(1.1.8?
)... or not even that... don't expect much...
128 bit is ok. but IE 3.0 will not be ok.
tip: think twice before buying something. try to get information in time.
still you could be content with your device. you'll see if this is the case...