[android-developers] KeyEvent definitions / meanings?

Can someone point me to documentation with the definitions / meanings
(i.e., what action is expected to be performed) for the KeyEvents?

Aside from the obviouse KEYCODE_A to KEYCODE_Z, etc. there are some
that I don't understand and I cannot find any mention anywhere on the
web ?!

Specifically the following, but generally all of them:

KEYCODE_EXPLORER
KEYCODE_ENVELOPE

Also, is there a meta-key to dismiss the keyboard via an injected
KeyEvent?

-thanks in advance,
Bob

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