DSR     Device Status Report    ESC[6n
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    Name:
    Device Status Report

    Syntax:
    ESC[6n

    Info:
    This ANSI command reports the current cursor position to the
    current input device. This is a very interesting command, as
    it allows you to check whether some ANSI driver is installed,
    by checking if the input device contains some characters, if not,
    no ANSI driver is installed.

    The information returned, by the way, is in the format of the
    ANSI Cursor Position Report command (CPR).