These work in any document. F7 gives a word, Shift-F7 a Bible passage, F6 a tune and Shift-F6 a doodle.
They don't use the normal random number generator. Instead, they read the CPU cycle counter at the moment of your key press, so your timing picks the word, from a list of 7,569. When more bits are needed, a timer window asks you to press OKAY again.