MASK field in ARSSEG - bit meaning

[Lars Bencze]

Does anyone have a list (full or partial) of the what the different bits in the MASK field of ARSSEG are for?
A guy asked us, the theory is that one or more of the bits determine which date style is used in the Segment date field of the table?

[Justin Derrick]

Someone's digging down deep into the weeds!  :)  What are you trying to do?

-JD.