The following code illustrates creating a modal window, similar to WinMessageBox, that can be used to display error messages and ask questions.

 #define INCL_SW
 #include <os2me.h>

 SMBD Smbd[4] = {{ "~Save",    ID_SAVE,BS_DEFAULT},
                          { "~Discard", ID_DISCARD,0},
                          { "Cancel",   ID_CANCEL,  0},
                          { "Help",     ID_HELP,    BS_HELP}};

 SMBINFO SmbInfo;
 ULONG   Result;

 SmbInfo.hIcon = NULL;
 SmbInfo.cButtons = 4;
 SmbInfo.hwndNotify = NULL;
 SmbInfo.flStyle = MB_QUERY;
 SmbInfo.psmbd = Smbd;

 Result = WinSecondaryMessageBox (HWND_DESKTOP,
                                  HWND_DESKTOP,
                                  "Changes have not been saved.",
                                  "Title",
                                  ID_SAVEPROMPT,
                                  &SmbInfo);