numlines

    If it is 0, the newwin function sets that dimension to LINES
    (begin_y). To get a new window of dimensions LINES by COLS, use
    the following line:

    newwin (0, 0, 0, 0)

 numcols

    If it is 0, the newwin function sets that dimension to COLS
    (begin_x). Therefore, to get a new window of dimensions LINES
    by COLS, use the following line:

    newwin (0, 0, 0, 0)

 begin_y

    A window coordinate.

 begin_x

    A window coordinate.