[Elecraft] K3 RS232 port, "KEY"?

[Doug Faunt N6TQS +1-510-655-8604]

I see in the K3 FAQ that DTR and/or RTS on the RS232 I/F can be
assigned to "KEY".

Does anyone happen to know if this includes FSK keying, when in that
mode?  If not, it ought to.

73, doug