Hello,I am trying to find out the changes between the class php files, in particular "class.client.php" and "class.usersession.php", between versions 1.7.5 and later ones. I have noticed that, for example, the file class.client.php is very similar between 1.8.3 and 1.9.1 but is, I believe, quite different between 1.7.5 and later versions.In general how can I find changes between identically named files between versions.Thanks,Mike