Creating BPS Group - BPS ID

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Hi,

I want to add a new BPS Group that will collect members of a given team. I don't have this group in active directory. I don't fully understand what is the meaning of Group identifier (BPS ID). It has to be in the UPN Format. In the knowledge base there is an article where the BPS ID is [some name]@webcon.pl. My questions are as follows:
1) Could I also use "@webcon.pl"? Or should I rather use my domain name?
2) Is this group only within Webcon or will it be visible in Active Directory of my organization?
3) Is it only an identifier, or does the domain name matter in some way? In other words, can I fill the BPS ID with [my name]@BPSGroups.com or any other random domain name?

Will be grateful for your help.