BUTTON is documented to pass the UUIDs of the controller *and* the sitter when they are different, separated by a "|".
ADJUST is not documented to do that (yet), but it behaves that way.
Both behaviours are undesirable for generic scripts that respond to a link message without being specifically designed for AVsitter, because they don't expect the extra UUID. This can be seen as an AVsitter shortcoming, therefore we implement backwards-compatible workarounds.
For ADJUST, the AMENU argument's range has been extended:
0, 1 and 2 behave the same as before.
4, 5 and 6 behave as 0, 1 and 2 respectively, but also inhibit sending the second UUID.
For BUTTON, two special values have been added for the ID field: <C> and <S>, which will be replaced with CONTROLLER and SITTER respectively. For example:
BUTTON text|num|str
behaves the same as before, sending both CONTROLLER and SITTER in the UUID field when they differ; however:
BUTTON text|num|str|<C>
always passes only the UUID of the person who controls the menu. Similarly for <S>.