Global catalog VS infrastructure master

I read this from an article
"The infrastructure master is responsible for updating references from objects in its domain to objects in other domains. The infrastructure master compares its data with global catalog. Global catalogs receive regular updates for objects in all domains through replication, so the global catalog's data will always be up-to-date. If the infrastructure master finds data that is out-of-date, it requests the updated data from a global catalog. The infrastructure master then replicates that updated data to the other domain controllers in the domain."

But I don't understand the first sentence here..  The infrastructure master is responsible for updating references ""from objects in its domain to objects in other domains""

The IM is not at domain level?? I mean its own domain. Why it updates objects in other domain as well??
bubukoAsked:
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Brian PierceConnect With a Mentor PhotographerCommented:
In this context "other domains" are other domains within the same forest.
The Schema master and Domain Naming Master are FOREST BASED - only one per forest
the PDC Emulator, RID master and Infrastructure Master are DOMAIN BASED.

BTW in a multi-domain environment thr GC and IM are best kept on DIFFERENT machines - (in a single domain environment it makes no odds - keep all the roles on the same machine)
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bubukoAuthor Commented:
Thank you. But I think you didn't answer my question.....
"The infrastructure master is responsible for updating references from objects in its domain to objects in other domains."

I mean it's not GC's job to do the update with other GCs in other domains of the same forest? IM just keep comparing data with its domain's GC and if there is update, it update from the GC and replicate to other DCs in its domain. It's not like this?
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