#define IDM_FIRSTDOCUMENT 3000  // special IDs for documents start here
#define IDM_LASTDOCUMENT  3999  // no more than 1000 windows


//.....................................................................................................................
// UMW_MDI_DESTROY
// WPARAM: unused
// LPARAM: unused
//
// Sent to main frame to notify it that an MDI child window has been destroyed
// so that it can determine which menu to post in case it was the last MDI
// child
#define UWM_MDI_DESTROY    (WM_APP + 100) 

//.....................................................................................................................
// UWM_UPDATE_TOOLBAR
// WPARAM: unused
// LPARAM: unused
//
// Sent to the main frame window to indicate that it should update the
// tool bar icons
#define UWM_UPDATE_TOOLBAR (WM_APP + 101)

//.....................................................................................................................
// UWM_UPDATE_MENU
// WPARAM: unused
// LPARAM: unused
//
// Sent to an MDI child to indicate that there has been a change in status
// that requires updating the menu (not relevant, since this is usually 
// handled in the OnInitMenuPopup handler) and the toolbar (which requires
// the menu be up-to-date).
#define UWM_UPDATE_MENU    (WM_APP + 102) 

//.....................................................................................................................
// UWM_SET_ACCELERATOR
// WPARAM: unused
// LPARAM: handle of new accelerator table to use
// Result: HACCEL
// Handle of previous accelerator table
// Sent to the main frame to change the accelerator table being used
#define UWM_SET_ACCELERATOR (WM_APP + 103)

#define HANDLE_UWM_SET_ACCELERATOR(hwnd, wParam, lParam, fn) \
((LRESULT)(fn)(hwnd, (HACCEL)lParam))

//.....................................................................................................................
// UWM_CONTEXTMENU
// WPARAM: handle of control window
// LPARAM: LOWORD x-position
//    HIWORD y-position
//
// This is sent to the MDI child window, but is handled as a separate
// message.  Otherwise the DefMDIChildProc will route it to the main frame
// window, which, because of our dispatch, gives us an infinite recursion if
// the child window is not prepared to deal with it.  To give us robustness,
// we define a separate message which will be ignored if the child routes it
// back to the parent.
//
#define UWM_CONTEXTMENU   (WM_APP + 104)

#define UWM_RESETPAINTING (WM_APP + 105)

#define FORWARD_UWM_CONTEXTMENU(hwnd, hwndCtl, xPos, yPos, fn) \
(L_BOOL)(L_UINT32)(fn)((hwnd), UWM_CONTEXTMENU, (WPARAM)(HWND)hwndCtl, MAKELPARAM((xPos), (yPos)))

#define FORWARD_UWM_RESETPAINTING(hwnd, fn) \
(L_BOOL)(L_UINT32)(fn)((hwnd),UWM_RESETPAINTING,0,0)

L_BOOL MDI_OnContextMenu ( HWND hwnd, HWND hwndCtl, L_INT xPos, L_INT yPos, HMENU context ) ;
L_VOID MDI_ConformMenus ( HMENU hMaster, HMENU hPopup ) ;
HWND   MDI_Create ( HWND hwnd, L_UINT32 styles, L_INT classid, L_INT titleid, L_INT nX, L_INT nY, L_INT nWidth, L_INT nHeight );

extern HWND g_MDIClientWnd ;