All the machines in the picture were running FreeBSD which was our development platform.  We were doing kernel &amp; networking development work and BSD was much better documented because of the second Stevens book.<p>Userspace was a lot of crappy C++ code using the bits of the STL which worked across gcc &#x2F; whatever Sun&#x27;s compiler was called &#x2F; Windows VC++ (which was <i>not</i> a large intersection at that time).