Keyboard Traversal of Tree (standard?)

Got a question for some of the more web savvy guys out there.

We've got a tree-like structure in one of our apps, this is a web-
based application, off the intranet at work. Anyway, we got this tree
and we have some keyboard accessibility. Mainly, you can traverse the
tree using the TAB key and shift-TAB to go up. Pressing ENTER opens a
tree/node, and ENTER again closes. We also have a menu, that normally
you would access using the mouse (right-click). This menu should be
able to pop-up anywhere in the tree at any context (parent, child,
grandchild, etc).

What would be an appropriate key to assign this to?

Currently we've assigned the ESC key, but it doesn't seem very
intuitive to me. ESC to me, has always been associated with exiting
or cancelling something. Any thoughts?

.

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