NAME
    Input -- Identify the program's initial input file handle

SYNOPSIS
    file = Input()
    D0

    BPTR Input(void)

FUNCTION
    Input() is used to identify the initial input stream allocated when
    the program was initiated.  Never close the filehandle returned by
    Input!

RESULTS
    file - BCPL pointer to a file handle

SEE ALSO
    output(), selectinput()