Computers used in such a context differs from other computers in several ways, the most important being that both hardware and software must support real-time applications.
Further details are here .
Additionally, we have a second and faster computer, cheetah.uio.no, a Sun UltraSparc 2 Creator, working in close coupling with the above. But currently we are using the Apache httpd 1.3.2 . The reason is partly claims of higher speed, partly the enhancements in redirect, access control and status surveillance facilities. Server statistics are available. We mirror the Apache httpd manual.