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Search didn't turn up anything on this, but it could apply to a NUMBER of things. It has to do with timing of simultaneous events and order of resolution, when it involves 'mirror' units that are attempting to use the same thing.

For example, if 2 Necrons are going at it in Close Combat and both have Mindshackle Scarabs. This could also affect things like the Purifier psychic power being able to remove models that would bridge units restricting the damage the opposing purifier squad could do, etc.

Option A.
The current turn player gets to resolve each individual instance of everything that resolves at the same time. So in the Necron Example, the player who's turn it is would charge with his D-Lord/Wraith squad, force his opponent to use his MSS, then issue the challenge, then use the D-Lords MSS on the opposing Lord. This is what I'm thinking it is, and have assumed it to be the case, until the alternative was presented to me.

Option B.
The current turn player gets to choose the order of each event, but each instance of that event must resolve. So in the above Example, the D-Lord player would charge, and have to choose between forcing ALL Mindshackle Scarabs first, then issuing the challenge. Or, issuing the challenge, and if the opposing Necron accepts, they BOTH have to roll MSS. I'm not discounting that it could be this way but it is a possible interpretation.

Thoughts (or errata/posts that I may have missed when trying to figure this one out)?

There's nothing in the rules to suggest that similar events must all be resolved at once. "I use MSS" and "You use MSS" are two different events, so the current player gets to choose when (amongst all the other things happening at the same time) each resolves.

Whoevers turn it is, is the player who decides the order of simultaneous operations like MSS.

As above. Even when same player has to perform two actions they choose.

Breaking work policy again but:
I believe it is page 7 which informs us what the turn consists of, and on this page is an exception cause that informs of situations that might change the normal order of events found within the section being detailed. Those situations all involve one core element: Multiple rules trying to trigger at the very same point in the time line. This section details how we determine the order which the rules resolve and there are no instructions granting permission to try and resolve them both at the same time. A few rare scenarios do exist that are exceptions to this exception, but in those scenarios the Rules will spell out how we go about resolving them.

For example:
The same initiative step in Assaults.

The interpretation issue is
Does the player get to choose when Mindshackle Scarabs work, requiring both players to use them at the same time. This falls in line with how same initiative stuff works. ex. 2 Powerfists would both get to swing, and that resolving one before the other doesn't prevent the 2nd one from using his, even if he dies.

or

Does the player get to choose that his Mindshackle gets to go at a different time than his own? This, is how I have looked at it, and how I would play it if the situation ever came up in a game. It wasn't even an issue till someone brought up that it COULD be the other way around.

 Imperator_Class wrote:
Whoevers turn it is, is the player who decides the order of simultaneous operations like MSS.

The question in my mind then becomes -

If the second necron losses the MMS roll and has to attack his own allies, can the player of the first necron, force the use of the second necrons MMS attack on the second necrons own allies or does MMS not count as a CC attack?

MSS is not a CC attack.

rigeld2 wrote:
MSS is not a CC attack.

Sort of, but it's resolved "before any blows are struck", the same wording used to describe when a Challenge must be issued.

 grendel083 wrote:

rigeld2 wrote:
MSS is not a CC attack.

Sort of, but it's resolved "before any blows are struck", the same wording used to describe when a Challenge must be issued.

No - it's not a CC attack at all. Read the post I was replying to - the timing of it is irrelevant for his question.