Hello.  Kenwood has a driver they recommend you use with USB cables 
for the TH-F6A.--Matt, N1IBB.

At 06:57 PM 1/29/2015 -0800, you wrote:
>Hi!
>
>
>
>After exhaustively failing with the Kenwood PG-4YU programming cable, I
>purchased the RT Systems KRS-F6 Programming Kit for the Kenwood TH-F6 (MCP
>software and cable).  Regrettably, this software is inaccessible.  This
>cable has some sort of built-in functionality where it does not use a COM
>port; meaning that it seemingly only works with the RT Systems software.
>Put another way, it will not work with the Kenwood MCP software; which is
>totally accessible, but which requires use of a COM port.
>
>
>
>Now I am in the worst of both worlds.  While the RT Systems cable may work,
>its related software is inaccessible.  On the other hand, While Kenwood's
>MCP software is totally accessible, the Kenwood programming cable does not
>work.
>
>
>
>Therefore, has anyone found a way to make the RT Systems software accessible
>(with JAWS)?  Or, has anyone found a way to make the RT Systems cable work
>with Kenwood's MCP (i.e., use a COM port)?
>
>
>
>73,
>
>Richard KK6MRH