Text services: Vista Extensions (UI Elements)

The TSF tour ends here, with a brief discussion of UI Elements in Vista

If your text service wishes to be available in full-screen applications like games, it must implement ITfUIElement, and call the ITfUIElementMgr whenever the text service wants to display some UI. (See the discussion of UILess mode in MSDN.)

Interface	How Obtained
ITfUIElement	Passed to ITfUIElementMgr::BeginUIElement
ITfToolTipUIElement	QI from ITfUIElement
ITfCandidateListUIElementBehavior	QI from ITfUIElement
ITfCandidateListUIElement	QI from ITfUIElement
ITfReadingInformationUIElement	QI from ITfUIElement

Text services that implement  ITfUIElement should also register in the GUID_TFCAT_TIPCAP_UIELEMENTENABLED category, as well. 

Unfortunately, as of this date, I do not know of any sample text service that implements ITfUIElement.