XF 2.1 maximum conversation recipients

Apologies if this is a stupid question as the title seems to be apparent but I am just checking. If I set this at 1 for a User Group does that mean it pretty much operates as a Private Messaging system as we would know it on other Forum software? ie forum members can only message one on one.

And if I up this value from 1 for another User Group then that allows them to invite other members into the conversation from members also in that group? Must they be in that Group? I am thinking subscriptions here.

The 'conversation' aspect is a lot to understand for me let alone my users so I'm trying to get my head around it.

Haven't migrated to a live site with this software just yet so can't test it.

Thanks for any help
 
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