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Sequence Significance
# holding down <SQUARE> and pressing another key
| holding down <DIAMON><DIAMOND> and pressing another key
~A pressing <SQUARE> and releasing it before another keypress
~C pressing <DIAMOND> and releasing it before another keypress
|[ <ESC> key
~E <ENTER> key
~S <SHIFT> key (only generated if <SHIFT> had an effect)
~I <INDEX> key
~M <MENU> key
~H <HELP> key
~X <DEL> key
~U <UP> arrow key
~D <DOWN> arrow key
~L <LEFT> arrow key
~R <RIGHT> arrow key
## a single # (hash) character
|| a single | character
~~ a single ~ tilde (pronounced 'tilda' or 'twiddle')
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