This function creates a modal window, similar to WinMessageBox, that can be used to display error messages and ask questions.
#define INCL_SW #include <os2.h> HWND hwndParent; /* Parent window handle. */ HWND hwndOwner; /* Owner window handle. */ PSZ pszText; /* Message text. */ PSZ pszCaption; /* Title of secondary message box window. */ ULONG idWindow; /* ID of window. */ PSMBINFO psmbinfo; /* Information block. */ ULONG rc; /* Results. */ rc = WinSecondaryMessageBox(hwndParent, hwndOwner, pszText, pszCaption, idWindow, psmbinfo);