Thank you very much for this reply. This seems to direct me to the right way. First I have to understand it totally but there are many hints to search for.

Thank you

Hi.. I want to build a webserver where multiple users can login. Each with his own account. I want to know who is when logged in and I want to store the information in a database. The login is exclusive with smartphones. How is it possible to create many user account for a web page and how can I tra...