I need some code that was made available by a student 15 years ago, but is no longer online. How can I contact someone in the group to get the code?
PhD students come and move on, so if you are looking for code that isn't exactly brand new then contacting the responsible professor is usually your best bet. That being said, I would not get my hopes up too much that you get your code "urgently". There is a good chance that even the responsible professor will need to do some good ol' digging before (s)he unearths this material, if at all (and then there is still a good chance that nobody knows anymore how to make it work, or that it does not run anymore on today's platforms). Assume that this is going to be a bit of a project on its own.