Standard keys in the Editor
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HOME		moves the cursor to the line begin
END		moves the cursor to the line end
BACKSPACE	deletes the character at the left of the cursor
DELETE		deletes the character under the cursor
F1		marks block begin
F2		marks block end
F3		moves the cursor one word left
F4		moves the cursor one word right
F5		deletes from the cursor to the line begin
F6		deletes from the cursor to the line end
F7		deletes the current line
F8		deletes the word under the cursor
