| Submessage | Description |
| IMC_CLOSESTATUSWINDOW | Applications send this message to the IME window to hide the status window. |
| IMC_GETCANDIDATEPOS | Applications send this message to the IME window to retrieve the current position of the candidate window. The IME can adjust the position of the candidate window (for example, to make it fit within screen boundaries), and the application can choose to reposition it. |
| IMC_GETCOMPOSITIONWINDOW | Applications send this message to the IME window to retrieve the current position of the composition window. The IME can adjust the position of the composition window, and the application can choose to reposition it. |
| IMC_GETSTATUSWINDOWPOS | Applications send this message to the IME window to retrieve the position of the status window. |
| IMC_OPENSTATUSWINDOW | Applications send this message to the IME window to display the status window. |
| IMC_SETCANDIDATEPOS | Applications that rely on the IME to display candidates send this message to the IME window to set the candidate window's position. |
| IMC_SETCOMPOSITIONFONT | Applications send this message to the IME window to specify the logical font for displaying intermediate characters in the composition window. |
| IMC_SETCOMPOSITIONWINDOW | Applications send this message to the IME window to set the style of the composition window. This message applies the style to the current input context so that each IME window associated with that context will use that style. The default style is CFS_POINT, which sets the IME window position next to the current insertion point. |
| IMC_SETSTATUSWINDOWPOS | Applications send this message to the IME window to set the position of the status window. |