Fronds docs
Movement
alt-N cursor right
alt-H cursor left
alt-C cursor up
alt-T cursor down
alt-R cursor to definition of word under it
alt-G cursor back (like back button of a browser). Useful after a search or jump to definition
Searching
alt-s I hate this key sequence, but it'll have to do for now. While you hold at least one key (space is nice, since it doesn't do anything in this mode) type a word. When you release all the keys the editor will jump to the definition of that word (if it has one.)
Misc
alt-X Quit
alt-backspace delete the word under the cursor from the current definition.
Executing
alt-space Hold space while you type a word. When you release all keys it'll execute that word.