| mc_MT_HITTESTINFO | Structure for MC_MT_HITTEST message |
| mc_MT_ITEMA | |
| mc_MT_ITEMW | |
| mc_MT_TABWIDTH | Structure for messages MC_MTM_SETWIDTH and MC_MTM_GETWIDTH |
| mc_NM_MT_CLOSEITEM | Structure for MC_MTN_CLOSEITEM notification |
| mc_NM_MT_DELETEITEM | Structure for MC_MTN_DELETEITEM notification |
| mc_NM_MT_SELCHANGE | Structure for MC_MTN_SELCHANGE notification |
| mc_NMBCDROPDOWN | |
| MC_VERSION | Structure describing MCTRL.DLL version |