In PHP, you have $_GET and $_POST. In Joomla 1.5 framework, that is easy and quite similar with ASP.Net.
JRequest, then you can access GET and POST.
More information, http://docs.joomla.org/Retrieving_data_from_GET_and_POST_requests
Finally, I found out how to change the homepage title at Joolma 1.5. I can't change my homepage title,"Welcome to the front page" for months. That is because I am busy and lazy. But that is very easy.
1. go to Menu Manager.
2. Edit the "Home" Menu Option.
3. Then there is an option under "Paremeters - System" for page title
I am looking for the tools to do a Multilingual Joomla. I found Joom!fish. It works prefectly fine, if your website has a same structure across different language version. But in my case, that is hard. Because each version has a unique menu structure. All of them are very similar, but not exactly same. So, Joom!fish is not a solution in this case.
I built a Joomla for my Church and gave Chinese Version Admin interface for that instance. I found the problem on translation. Because that is built by some Taiwan Opensource Developers. That is not suit for Hong Kong People. Even Taiwan and Hong Kong both are using Chinese. My users gave me the feedback they can't understand some wording in Admin interface. Thus, I suggest please do a focus group review before you give them a final solution!