This is a very special section: 'identifiers' tries to list and explain all the values you need to identify a certain item or state. As such, 'identifiers' are not part of pure programming logic or documentation. In fact in most parts this is just convention and system design: how to identify a certain button/playback/palette, how to tell which state a certain item to set to, etc.
Identifiers may be of various data types: there may be very complex ones, e.g. Handle, and there are others which are simply a string or even a number which you only need to know and set as argument for a specific function or variable.
Identifiers listed here: