| Submessage | Description |
| IMN_CHANGECANDIDATE | Sent before an IME changes the content of its candidate window. Applications that display candidate windows themselves should process this message by calling ImmGetCandidateListCount and ImmGetCandidateList. |
| IMN_CLOSECANDIDATE | Sent before an IME closes its candidate window. It notifies applications that candidate processing has finished. |
| IMN_CLOSESTATUSWINDOW | Sent before an IME closes its status window. |
| IMN_GUIDELINE | Sent before an IME displays an error message or other message. Applications can process this message by calling ImmGetGuideline. |
| IMN_OPENCANDIDATE | Sent before an IME opens a candidate window. Applications that display candidate windows themselves should process this message by calling ImmGetCandidateList-Count and ImmGetCandidateList. |
| IMN_OPENSTATUSWINDOW | Sent before an IME creates a status window. Applications that display status windows themselves should process this message by calling ImmGetConversionStatus. |
| IMN_SETCANDIDATEPOS | Sent before an IME moves its candidate window. This message notifies applications that candidate processing has finished. Applications can call ImmGetCandidateWindow to get the new position. |
| IMN_SETCOMPOSITIONFONT | Sent when the input context's logical font changes. Appli-cations and IMEs can call ImmGetCompositionFont to determine the new font. |
| IMN_SETCOMPOSITIONWINDOW | Sent when the input context's composition form (the cfCompForm field) changes. Applications can call ImmGetCompositionWindow to get the new position. |
| IMN_SETCONVERSIONMODE | Sent when the input context's conversion mode changes. Applications can call ImmGetConversionStatus to retrieve the new mode. |
| IMN_SETOPENSTATUS | Sent when an IME is opened or closed. Applications can call ImmGetOpenStatus to retrieve the current status. |
| IMN_SETSENTENCEMODE | Sent when the input context's sentence mode changes. Applications can call ImmGetConversionStatus to retrieve the new mode. |
| IMN_SETSTATUSWINDOWPOS | Sent when the input context's status window position (psStatusWndPos) changes. Applications can call ImmGetStatusWindow to get the new position. |