Added info about vmoptions files.

git-svn-id: http://svn.igniterealtime.org/svn/repos/messenger/trunk@1274 b35dd754-fafc-0310-a699-88a17e54d16e

documentation/docs/install-guide.html

@@ -157,6 +157,15 @@ stop the service.</p>
 at this time. If you install the service, you should use service controls
 as described above to control the server rather than the graphical launcher.</p>
 
+<h3>Custom Parameters</h3>
+
+<p>Advanced users may wish to pass in parameters to the Java virtual machine (VM) to customize the runtime environment of Jive Messenger. You can do this by creating vmoptions files in the bin/ directory of your Jive Messenger installation. For the Windows service, you'd create a new text file called messenger-service.exe.vmoptions. Each parameter to the VM should be on a new line of the file. For example, to set the minimum and max VM heap size to 256 MB, you'd use:
+
+<pre>-Xms256m
+-Xmx256m</pre>
+
+To create parameters for the normal launcher, create a file called messengerd.exe.vmoptions (since the messenger.exe launcher invokes the messengerd.exe executable to actually start the server).
+
 <h2><a name="unix">Running Jive Messenger in Linux/Unix</a></h2>
 
 You can start and stop Jive Messenger using the <tt>bin/messenger</tt> script in your Jive messenger installation: