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<B>Packages</B></FONT></TH>
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<TD WIDTH="20%"><B><A HREF="com/google/appengine/api/package-summary.html">com.google.appengine.api</A></B></TD>
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<TD WIDTH="20%"><B><A HREF="com/google/appengine/api/appidentity/package-summary.html">com.google.appengine.api.appidentity</A></B></TD>
<TD>The app identity API allows an App Engine app to sign an arbitrary 
 string blob using an internally-generated, rotated private key.</TD>
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<TD WIDTH="20%"><B><A HREF="com/google/appengine/api/backends/package-summary.html">com.google.appengine.api.backends</A></B></TD>
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<TD WIDTH="20%"><B><A HREF="com/google/appengine/api/blobstore/package-summary.html">com.google.appengine.api.blobstore</A></B></TD>
<TD>The blobstore API provides management and persistent storage of large,
 immutable blobs.</TD>
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<TD WIDTH="20%"><B><A HREF="com/google/appengine/api/capabilities/package-summary.html">com.google.appengine.api.capabilities</A></B></TD>
<TD>The capabilities API.</TD>
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<TD WIDTH="20%"><B><A HREF="com/google/appengine/api/channel/package-summary.html">com.google.appengine.api.channel</A></B></TD>
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<TD WIDTH="20%"><B><A HREF="com/google/appengine/api/datastore/package-summary.html">com.google.appengine.api.datastore</A></B></TD>
<TD>The datastore provides persistent storage for App Engine applications, used
 either directly or via the provided JDO or JPA interfaces.</TD>
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<TD WIDTH="20%"><B><A HREF="com/google/appengine/api/files/package-summary.html">com.google.appengine.api.files</A></B></TD>
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<TD WIDTH="20%"><B><A HREF="com/google/appengine/api/images/package-summary.html">com.google.appengine.api.images</A></B></TD>
<TD>This package provides facilities for the creation and manipulation of
 images by Java code.</TD>
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<TD WIDTH="20%"><B><A HREF="com/google/appengine/api/mail/package-summary.html">com.google.appengine.api.mail</A></B></TD>
<TD>App Engine applications can send email messages on behalf of the app's
 administrators, or of authenticated users, using the standard
 <code>javax.mail</code> interface over this low-level API.</TD>
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<TD WIDTH="20%"><B><A HREF="com/google/appengine/api/memcache/package-summary.html">com.google.appengine.api.memcache</A></B></TD>
<TD>The memcache API provides access to fast but unreliable data storage, which
 may also be accessed via the <A href=
 "https://jsr-107-interest.dev.java.net/javadoc/javax/cache/package-summary.html">
 JCache API</A>.</TD>
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<TD WIDTH="20%"><B><A HREF="com/google/appengine/api/oauth/package-summary.html">com.google.appengine.api.oauth</A></B></TD>
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<TD WIDTH="20%"><B><A HREF="com/google/appengine/api/taskqueue/package-summary.html">com.google.appengine.api.taskqueue</A></B></TD>
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<TD WIDTH="20%"><B><A HREF="com/google/appengine/api/urlfetch/package-summary.html">com.google.appengine.api.urlfetch</A></B></TD>
<TD>The URL Fetch service can be used to make HTTP and HTTPS requests of other
 servers on the internet.</TD>
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<TD WIDTH="20%"><B><A HREF="com/google/appengine/api/users/package-summary.html">com.google.appengine.api.users</A></B></TD>
<TD>The <CODE>UserService</CODE> provides facilities to check whether a user has
 authenticated using their Google Account, retrieve their email address,
 and check whether they are an administrator for this application.</TD>
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<TD WIDTH="20%"><B><A HREF="com/google/appengine/api/utils/package-summary.html">com.google.appengine.api.utils</A></B></TD>
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