[Scan-DC] PRO-2006 OS question

[b_thom at juno.com]

http://strongsignals.net/access/content/new_user.html
says:

"What Is Reaction Tune?
It is a patented technology by Optoelectronics that allows selected
frequency counters to automatically tune a scanner to the frequency that
it just captured so that you can listen to the signal without having to
manually tune to it. 

At this time, only the following frequency counters support Reaction
Tune: 

Optoelectronics: CD100, Mini Scout, Scout 
At this time, only the following receivers support Reaction Tune: 

Icom: IC-R10, R7000, R7100, IC-R8500, & IC-R9000 
AOR: AR2700, AR8000, AR8200, AR8600 
RadioShack: PRO-2005/2006 w/OS456 & PRO-2035/2042 w/OS535 
OptoCom: with optional ComCounter installed"

What is the magic key combo that lets me see what OS is in use on a
PRO-2006?