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Wpush, Wpop

Save/Restore window to buffer

Header File.....TCXLwin.h

Prototype.......VOID CTYP Wpop(VcelP wb, IntT sr, IntT sc, IntT er,
                     IntT ec);
                VcelP Wpush(IntT sr, IntT sc, IntT er, IntT ec);

Arguments.......wb -  Pointer to Window Buffer
                sr -  Start Row
                sc -  Start Column
                er -  End Row
                ec -  End Column

Returns.........Address of newly-created window buffer, or NULL if not
                enough memory.

Notes...........Saves a region of the screen and allocates memory to hold
                the buffer, or restores a previously saved region of the
                screen and frees the memory allocated by Wpush().

                Wpush() is identical to Wsave(); Wpop() is identical to
                Wrestore() except it will restore the window to a new
                screen location.