[xwiki-devs] What is $msg ?

Hello Devs, In the past few days, I have been looking a lot at the Velocity templates and the Xwiki core code. There are a few things I am not able to understand. 1) Where is $msg variable defined in the core code? I see it a lot in the scripts. Is it a hashtable for messages. Where is it defined? 2) what is referred to by "xpage","xredirect" For eg. in the following mehtod from Utils.java public static String getPage(XWikiRequest request, String defaultpage) { String page; page = request.getParameter("xpage"); if ((page == null) || (page.equals(""))) { page = defaultpage; } return page; } does this mean, that if a page with that name exists in the template directory(xpage), it will be returned. But, what is defaultpage? Currently the login page does not show any error if the provided credentials are wrong. (authentication with LDAP) A look at the LoginErrorAction.java in the Web package revealed that it returns the same string as the LoginAction - "login" so, if I created anither loginerror.vm in teh templates folder and returned "loginerror" in the render function of this LoginErrorAction.java class, it would run the new script. But, at this stage I do not know what would be the content of the loginerror.vm.... #xwikimessageboxstart($msg.get("error") $msg.get("notallowed")) - would this work? I picked this up from accessdenied.vm ... Thanks for all help Thanks