Why asynchronous RFC is stated as asnynchronous processing type ?

in help document it stated that ,in r/3 system asynchronous RFC has different meaning...
what is that meaning?
why it stated as asynchronous processing type?

Asynchronous remote function calls (aRFCs) are similar to transactional RFCs, in that the user
does not have to wait for their completion before continuing the calling dialog. There are three
characteristics, however, that distinguish asynchronous RFCs from transactional RFCs:
When the caller starts an asynchronous RFC, the called server must be available to
accept the request.
The parameters of asynchronous RFCs are not logged to the database, but sent directly
to the server.
Asynchronous RFCs allow the user to carry on an interactive dialog with the remote
The calling program can receive results from the asynchronous RFC.
You can use asynchronous remote function calls whenever you need to establish communication
with a remote system, but do not want to wait for the function’s result before continuing
processing. Asynchronous RFCs can also be sent to the same system. In this case, the system
opens a new session (or window) and allows you to switch back and forth between the calling
dialog and the called session.
To start a remote function call asynchronously, use the following syntax:
Destination ...
I hope it helps.

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