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Only the client (connection originator) may send Request, LocateRequest, and CancelRequest messages, if Bi-Directional GIOP
is not in use.
Clients may have multiple pending requests. A client need not wait for a reply from a previous request before sending another
request.
Servers may reply to pending requests in any order. Reply messages are not required to be in the same order as the corresponding
Requests.
The ordering restrictions regarding connection closure mentioned in Connection Management, above, are also noted here. Servers
may only issue CloseConnection messages when Reply messages have been sent in response to all received Request messages that
require replies.