doxygen changes

documentation/htmldoxygen/pvaClientProcess.html

@@ -36,7 +36,34 @@
 <h1>PvaClientProcess</h1>
 
 <p>
-<b>Not Yet Written</b>
+pvaClientProcess is a synchronous wrapper for the pvAccess::ChannelProcess API, which is a callback based API.
+Thus it is easier to use than pvAccess::ChannelProcess itself.
+</p>
+<p>An instance of PvaClientProcess is created via a call to one of the followimg:</p>
+<pre>
+class PvaClientChannel
+...
+{
+...
+    PvaClientProcessPtr createProcess(std::string const & request = "");
+    PvaClientProcessPtr createProcess(epics::pvData::PVStructurePtr const &  pvRequest);
+...
+};
+<p>An instance of <b>PvaClientProcess/b> connects to a single channel.
+<b>PvaClientProcess</b> has both synchronous methods, which block, and non blocking methods.
+</p>
+<p><b>PvaClientChannel</b> has methods:</p>
+<pre>
+connect             Calls issueConnect and then waitConnect.
+issueConnect        issues a request to the server to create the server side of ChannelPut.
+waitConnect         blocks until server responds that it has created the ChannelPut.
+process             Calls issueProcess and then waitProcess.
+issueProcess        issues a process request to the server.
+waitProcess         waits until the server send a message that the process is complete.
+</pre>
+<p>
+Note that <b>issueConnect</b> and <b>issueProcess</b> do not block but all other methods
+do block.
 </p>
 
 </body>