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What does PGP email gateway licence cover?

Created: 08 Sep 2011 • Updated: 08 Sep 2011
I am trying to understand the architecture of the PGP Email Gateway, so far, documentations describe PGP email gateway as a seperate appliance. I would like if this can be verified, or know how the PGP Email Gateway architecture works.
How does PGP Email Gateway handle external users. PGP web/pdf messenger seems to serve this purpose, however, I would like to know how the PGP pdf/web messenger works in handling external users, or at the very least a dcumentation that can explain this explicitly.
What features does PGP Email Gateway licence, cover? Does licencing PGP email gateway licence automatically licence PDF/Web messenger, or PGP universal satellite?