Directory Opus uses the power of the Windows operating system in a way I haven't seen before. It has a tabbed fully multi-threaded design that builds on concepts the Australian developers learned over many years on the PC and other platforms including the Amiga! I use it as a complete replacement for Windows Explorer to provide the power and functionality that have long been missing in other explorer replacements. What amazes me is how I can have a number of file operations going on at the same time (true multitasking). It is infinitely configurable and just brilliant.