DEV_SYSTEMNOTIFYPDD (41h) - Length
Length
Contains the size of this structure,
in bytes, including Length itself. Valid Length values are 8, 12, and 24.
Length values of 8 and 12 are used for notifications pertaining to session
information, such as session creation, termination, saving/restoring of
sessions, and session switching. A length value of 24 is used for Alternate
Input Methods (AIM) value verifications and activations. Notifications
received with Length values other than those defined above should be returned
with an ERROR_INVALID_PARAMETER error code.
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