Category of alert to register.
This value can be the core alert category or an extended alert category
as defined below:
PRTALERT_CATEGORY_CORE - 0x00000001
PRTALERT_CATEGORY_EXTENDED - 0x0000D000
Beginning of the extended alert categories. Protocol
converters should limit the category range to between 0x0000D000 and 0x0000DFFFF.
PRTALERT_CATEGORY_EXT_MAX - 0x0000DFFF
End
of the extended alert categories.
If the protocol
converter does not support the given category, ERROR_INVALID_CATEGORY(117)
is returned.