win

    A pointer to the window.

 ch

    The character to be added. A new-line character (\n) clears the
    line to the end, and moves the cursor to the next line at the
    same x coordinate. A return character (\r) moves the cursor to
    the beginning of the line on the window. A tab character (\t)
    moves the cursor to the next tabstop within the window.