Modulation Session Refnum

[PhilG]

In the Modulation Toolkit 4.0, I came across something new (to me at least).  What is a Modulation Session Refnum? It appears to be required by the Reed Solomon Encoding/Decoding VIs and yes, I did find how to obtain one using open and close modulation session VIs.   I did see in theRS encode/decode example that it is opened, passed to both subVIs and then closed.  Normally I will not be using both encode and decode in the same VI.  This seems to be somewhat of a lone wolf - with no other information that I could find.  Can anyone provided information as to what this is for?

[Yardov]

For readers,

The answer was posted on the RF Froums.