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A session variable
is used to retrieve the content of a child of the root,
if it needs to be applied directly, as a condition of
the UDM. |
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One can use the session
variable in a predicate and then use that predicate on
the child nodes as applicable, achieving the same effect.
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Separate copies of
a session variable are created for each visitor to the
web site. |
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A session variable,
unlike the normal variable, persists until the user leaves
the web site. |
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It is important to
understand that session variables exist only in relation
to a particular user. The values assigned to session
variables in one user session don't affect the values
of the session variables in another user session, i.e.
the value of a session variable is not shared among
multiple users. Thus conflicts cannot arise because no
two users will ever have access to the same session variable. |
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Most session variables
are stored in a collection of the Session object named
Contents. |
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| Identifying a Session
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Each user is assigned
a separate session ID. |
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This is the unique
Identifier which is created when the user session is first
created and persists as long as the user remains on the
web site. |
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When different users
retrieve the page, a different session Id will be displayed
for each. However, if the same user retrieves the page
multiple times, the same session ID should be displayed.
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| Controlling when
sessions end |
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The server assumes
that if someone hasn't requested or refreshed a page for
a pre-specified period, that person has left the site
and therefore and times out that user's session. The period
is defined via an option during site creation. |
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This strategy enables
the server to recover resources that it has been using
to track the user's session. |
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The user can control
the maximum amount to time for which a user is allowed
to be inactive before a session times out. |
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When a user session
times out and the user makes a new request, the server
treats the user as a new user. The server now creates
a new session, and all the old session information
is lost. |
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