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At present, PuTTY's default response to DA (CSI c) is CSI ? 6 c, which denotes a VT102. This is slightly inconsistent with xterm, which returns CSI ? 1 ; 2 c -- a VT100 with AVO. Since PuTTY supports quite a few VT400 options, I suspect it would be more sensible for it to return something in the 6x range, perhaps based on the current compatibility level set by DECSCL. Maybe it should even be configurable -- it is on a VT420. We've had a report of this causing problems with entry of greek text, and a suggested replacement: <email@example.com> (suggesting CSI ? 62 ; 1 ; 2 ; 6 ; 7 ; 8 ; 9 c). Haven't analysed this solution yet. There have been several reports of our inaccurate response causing trouble with VMS hosts.
Audit trail for this semi-bug.