s sent with an LDAP operation,
while the <code>HasControls</code> interface is used to retrieve
response controls associated with enumeration results.
<p>
For example, suppose an LDAP server sends back a "change ID" control in response
to a successful modification. It would supply a class <code>ChangeIDControl</code>
so that the application can use this feature.
An application would perform an update, and then try to get the change ID.
<blockquote><pre>
// Perform update
Context ctx = ectx.createSubsubconte