usmessageid (USHORT)

Type of window queried.

Specifies the type of window to query. The value can be any of the following constants:

HMQW_INDEX

The handle of the index window.
HMQW_TOC
The handle of the Table of Contents window.
HMQW_SEARCH
The handle of the Search Hitlist window.
HMQW_VIEWEDPAGES
The handle of the Viewed Pages window.
HMQW_LIBRARY
The handle of the Library List window.
HMQW_OBJCOM_WINDOW
The handle of the active communication window.
HMQW_INSTANCE
The handle of the help instance.
HMQW_COVERPAGE
The handle of the help manager multiple document interface (MDI) parent window. It is where the secondary windows are contained within the parent window.
HMQW_VIEWPORT
The handle of the viewport window specified in the low-order word of param1 and in param2.

When HMQW_VIEWPORT is specified in usmessageid, a value must be specified in usselectionid to indicate whether a res ID, ID number, or group number is being requested.

HMQW_GROUP_VIEWPORT
The group number of the window whose handle is specified in param2.
HMQW_RES_VIEWPORT
The res number of the window whose handle is specified in param2.
HMQW_ACTIVEVIEWPORT
The handle of the currently active window.
USERDATA
The previously stored user-data.

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