An application sends messages to activate and deactivate a tooltip control, add and delete tools, and so on.
TTM_ACTIVATE
TTM_ADDTOOL
TTM_DELTOOL
TTM_ENUMTOOLS
TTM_GETCURRENTTOOL
TTM_GETTEXT
TTM_GETTOOLCOUNT
TTM_GETTOOLINFO
TTM_HITTEST
TTM_NEWTOOLRECT
TTM_RELAYEVENT
TTM_SETDELAYTIME
TTM_SETTOOLINFO
TTM_UPDATETIPTEXT
TTM_WINDOWFROMPOINT