This guide outlines how to enable the built-in VPN service (vpnd) in client versions of OS X, as Apple has neglected to mention (let alone explain) the possibility under non-server editions of OS X. Standard disclaimer applies, as always: You are 100% responsible for your own actions. Using this guide, visiting a link, downloading a program, in short, living, is done entirely at your own risk (and joy).
Finally—and this is simply stunning—the National Archives' technology branch is so antiquated that it cannot process some of the most common software programs. Specifically, the study states, the archives "is still unable to accept Microsoft Word documents and PowerPoint slides."