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<concept id="GUID-6B97D07F-DF2A-5CF1-84A9-84DBE7CB2115" xml:lang="en"><title>System

Model Relationship</title><prolog><metadata><keywords/></metadata></prolog><conbody>

<p>The Messaging subsystem resides between Messaging applications and the

lower level subsystems that Messaging subsystem uses for storage and transmission

of messages. </p>

<p>See the latest version of the public <xref href="http://developer.symbian.org/wiki/index.php/Symbian_System_Model" scope="external">System Model</xref> from the Symbian foundation.</p>

<fig id="GUID-763A4790-2283-5D9A-8812-CB65C6E158C7">

<title>           System model relationship          </title>

</fig>

<dl>

<dlentry>

<dt>Message Viewers</dt>

<dd><p>Application for viewing a message. </p> </dd>

</dlentry>

<dlentry>

<dt>Message Centre</dt>

<dd><p>Application that displays list views of messages to the user, allowing

the user to perform operations such as copying messages, sending messages,

creating new messages and so on. </p> </dd>

</dlentry>

<dlentry>

<dt>Message Editors</dt>

<dd><p>Application for creating or editing a message. </p> </dd>

</dlentry>

<dlentry>

<dt>SendAs Clients</dt>

<dd><p>Messaging clients, such as Client MTM, client applications that implement

SendAs. </p> </dd>

</dlentry>

<dlentry>

<dt>EStore</dt>

<dd><p>Symbian platform component that provides stream based storage. It provides

the framework classes for the Message Store files. </p> </dd>

</dlentry>

<dlentry>

<dt>File system</dt>

<dd><p>A set of conventions used to access a drive, and the software that

implements those conventions. Local, ROM and installable file systems are

supported. </p> </dd>

</dlentry>

<dlentry>

<dt>SQL</dt>

<dd><p>A component that provides an SQL database service. Messaging subsystem

stores each <xref href="GUID-5A23B804-2C06-3407-9D48-1BFB212D699F.dita"><apiname>TMsvEntry</apiname></xref> (index entry) of the index file as

a row of an SQL table in the SQL database. For more information on how Messaging

subsystem has implemented SQL, see <xref href="GUID-5E8AA6B6-38EB-5347-BA30-F9FF4BF7C107.dita#GUID-5E8AA6B6-38EB-5347-BA30-F9FF4BF7C107/GUID-10265557-F31B-50B3-A955-A548A5A78D7B">Operating

with the SQL database</xref>. </p> </dd>

</dlentry>

</dl>

</conbody></concept>