These functions are defined in crs.c using the curses
library. Unless otherwise noted these routines return
successful completion and
#f for failure.
Returns a port for a full screen window. This routine must be called to initialize curses.
A program should call
endwinbefore exiting or escaping from curses mode temporarily, to do a system call, for example. This routine will restore termio modes, move the cursor to the lower left corner of the screen and reset the terminal into the proper non-visual mode. To resume after a temporary escape, call refresh.