about actor

A single actor processes the items on its mailbox one-at-a-time in the order the items were added to the mailbox *by the relevant partial-function* being used for a given call to receive or react

From: Caesar [dot] Jr [at] hotmail [dot] com
To: scala-user [at] listes [dot] epfl [dot] ch
Subject: [scala-user] about actor
Date: Mon, 23 Nov 2009 21:15:15 +0800

does the actor process the next message exactly after the first message,  or they can be processed at the same time?
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does the actor process the next message exactly after
the first message,
 or they can be processed at the same
time?