DragonFly belongs to the same class of operating systems as other BSD-derived systems and Linux. It is based on the same Unix ideals and APIs and shares ancestor code with other BSD operating systems. DragonFly is differentiated from other operating systems in its class by, among others, the HAMMER file system, Virtual Kernels, swapcache, and the pervasive use of soft token locks. DragonFly provides an opportunity for the BSD base to grow in an entirely different direction from the ones taken in the FreeBSD, NetBSD, and OpenBSD series.
STiB implements the client portion of the Microsoft BITS Upload Protocol, which is an extension to HTTP 1.1. BITS is a Windows service that manages file transfers to and from Web servers. BITS downloads use HTTP, but uploads use a proprietary extension. BITS is a highly used service, since it is responsible for downloading Windows patches and service packs.