florian_mrt:How about two different script files communicating with each other, eg a php file transfering data to an asp file?
Yes, you can do this.
Both PHP and ASP process "incoming HTTP requests". So, if you can get the data into an HTTP request, then you can pass whatever information you like between your PHP files and your ASP files. This means attaching the data to a querystring value, or "posting" a form from the PHP page to the ASP page, or visa versa. That is, the form in the PHP file can have an action value of the ASP page (<form action="process.asp">), so that the form data in the PHP page is posted to the ASP page. And the reverse would work, too.
Another option you have is to save the data either to a text file or to a database, so that both your PHP and your ASP pages can work with the same data.
Yet another option is to put some data into a cookie. If the data is not large, and if both your PHP and ASP pages are on the same domain, this would work.
Another option again to share Session data between your PHP and ASP pages. I've never done this myself, but this page links to an article about it. The article was unavailable when I tested the link, but it may come back online.
A final option is that you might choose either PHP or ASP, and simply translate those pages that are in the "other" technology. This might prove to be less work than trying to maintain a website using two separate technologies.