In the default filter for an eDirectory driver the GUID is set to
'synchronize' in the subscriber channel.

I'd like to know if it's needed there at all - can I either set it to
'ignore' or to 'notify'?

In this appnote ( )
it states "The filter for the Loopback driver must allow GUID on the
Subscriber Channel in order to detect events on User" - while this statement
directly refers to the loopback driver it may infer that the reason the GUID
is in the subscriber filter is to detect events for the user in eDirectory.
Does anyone know for sure whether this is true?