| mc_MT_HITTESTINFO | Structure for message MC_MTM_HITTEST |
| mc_MT_ITEMWIDTH | Structure for messages MC_MTM_SETITEMWIDTH and MC_MTM_GETITEMWIDTH |
| MC_MTITEMA | Structure for manipulating with the tab item (ANSI variant) |
| MC_MTITEMW | Structure for manipulating with the tab item (unicode variant) |
| mc_NM_MT_CLOSEITEM | Structure for notification MC_MTN_CLOSEITEM |
| mc_NM_MT_DELETEITEM | Structure for notification MC_MTN_DELETEITEM |
| mc_NM_MT_SELCHANGE | Structure for notification MC_MTN_SELCHANGE |
| MC_NMBCDROPDOWN | Structure for notification MC_BCN_DROPDOWN |
| MC_VERSION | Structure describing MCTRL.DLL version |