The TAGGING keyword indicates whether XCF or the application is responsible for setting note tag values. Every note in the note pad has a 16 byte tag value. The creator of the note pad determines whether the application is responsible for setting the note tag values, or whether XCF is responsible for setting them. When a single note request is issued, the TAGGING keyword must be specified to confirm who has responsibility for setting the tag values. The note request is rejected if the TAGGING specification does not match the TAGGING specification made by the creator of the note pad. This check ensures that the creator of the note pad and the users of the note pad exploit the same tagging protocol.

If XCF is responsible for setting the tag values, the tags will be ever increasing values set whenever a note is created or updated. If the application is responsible for setting the tag values, the tags are set whenever a note is created, updated, or deleted.