session related connection handling/cvs/mem

Hi, I have to build a extension for PHP, which is connecting to a special server over tcp/ip. For each session (client-php) a session related set of data has to be kept, inclusive the socket descriptors and so on. 1. How can I keep the relationship of the data and the session? The data consists of a c struct. 2. How I can determine which session is no longer used and can be freed? 3. At the moment my work rests in the cvs tree of our project, and I want them to stay there. How I can build the php extension (using php-internal build scripts) without great difficulties??? 4. Our project uses own memory functions, since the sources will be compiled on several different platforms. Do I have to use zend's exxx memory functions? regards Ron