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it unlocks old computer
http://tartarus.rpgclassics.com/mmbn4/walkthrough23a.shtml
The school key is in ACDC 2 in the big open square. Walk up to it, and a cutscene should be initiated. Otherwise, just press A. This will unlock the doors.
on the way to Central Area 3, there is a piece of green road that you cannot pass through, examine it and the key is there. Use the KeyData to open the gate to Central Area 3
The Seaside key is the reward from a collection of keys. I dont remember which collection though. If you get the key, you can open the Seaside treasure chest
To obtain the Lion's Key you need to complete a story quest in Africa. The quest involves recovering an item from the game's internet zones and bringing it back to Africa. The Lion Key will be your reward for this quest.
you need joker key
The red key in Megaman Blue Moon can be found in the square with the four horns around it. You have to go to the left side of the map and go up the path to the warp to Undernet.
vodafone345 text network key
i want to broker anther network key
Type the network key back in!!
The WEP key is the password for the wireless network. If you generate the key in dessid, when you try to join the network you can tap in the password box and select "Paste." Then the key will be pasted in and you can join the network.