The flags parameter of the MSGBOX command/function can be a combination of the following values:
| Flag | Value | Description |
| MB_OK | 0x00 | The message box contains one push button: OK. This is the default. |
| MB_OKCANCEL | 0x01 | The message box contains two push buttons: OK and Cancel. |
| MB_ABORTRETRYIGNORE | 0x02 | The message box contains three push buttons: Abort, Retry, and Ignore. |
| MB_YESNOCANCEL | 0x03 | The message box contains three push buttons: Yes, No, and Cancel. |
| MB_YESNO | 0x04 | The message box contains two push buttons: Yes and No. |
| MB_RETRYCANCEL | 0x05 | The message box contains two push buttons: Retry and Cancel. |
| MB_CANCELTRYCONTINUE | 0x06 | Microsoft« Windows« 2000/XP: The message box contains three push buttons: Cancel, Try Again, Continue. Use this message box type instead of MB_ABORTRETRYIGNORE. |
| MB_ICONHAND MB_ICONERROR MB_ICONSTOP |
0x10 | A stop-sign icon appears in the message box. |
| MB_ICONQUESTION | 0x20 | A question-mark icon appears in the message box. |
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MB_ICONEXCLAMATION MB_ICONWARNING |
0x30 | An exclamation-point icon appears in the message box. |
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MB_ICONASTERISK MB_ICONINFORMATION |
0x40 | An icon consisting of a lowercase letter i in a circle appears in the message box. |
| MB_DEFBUTTON1 | 0x00 | The first button is the default button. |
| MB_DEFBUTTON2 | 0x0100 | The second button is the default button. |
| MB_DEFBUTTON3 | 0x0200 | The third button is the default button. |
| MB_DEFBUTTON4 | 0x0300 | The fourth button is the default button. |
| MB_RIGHT | 0x00080000 | The text is right-justified. |
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