How does RequestFactory work on multiply transactions?

I read that RequestFactory is an alternative to GWT-RPC for creating
data-oriented services. RequestFactory and its related interfaces
(RequestContext and EntityProxy) make it easy to build data-oriented
(CRUD) apps with an ORM-like interface on the client. It is designed
to be used with an ORM layer like JDO or JPA on the server, although
this is not required.

But my question is: how does the RequestFactory does when it has to
send many records of a same entity? or when it has to send for
example a record user and many records of roles on a same form

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