OS_TABLETPC

When the IsOS function is given OS_TABLETPC as its dwOS argument, its answer is obtained by different methods in different SHLWAPI versions.

In the SHLWAPI version 6.0 from Windows Vista, and higher, the function returns TRUE if the following are both true:

• it can open an event with the name Global\TabletHardwarePresent;
• this event is in the signalled state (such that a wait with zero as the timeout interval returns without error).

In earlier builds, the function simply evaluates the system metric SM_TABLETPC (not caring whether this returns a result other than TRUE or FALSE).

Availability

The OS_TABLETPC case of the SHLWAPI function IsOS is supported in version 6.0 from Windows XP SP1, and higher. The Windows Vista SDK dated 2007 documents only the earlier implementation.