Right, I wanted to stop by and to tell you about the new PARCP 4.0 release and also the fresh Mac OS X build but I can see you guys are well informed.
So I can just confirm all that was said above - if you have PARCP-USB, Mac and Atari tell me your e-mail and I'll send you the OSX binary for testing. Also, if I can find 48 new PARCP-USB buyers I'll gladly release the PARCP as free software so not only Amiga version of PARCP will be really simple thing (the source code is very portable if you imagine that the same code base builds on Atari, Linux, Windows and Mac and runs on Motorola, ARM, Intel 32bit and AMD 64bit CPUs).
Also, the new version 4.0 of PARCP can start arbitrary programs on both Server and Client. It is quite exciting. Daniel Hedberg and Douglas Little use that for developing Falcon software on PC and then sending it via USB to their Falcons and starting it there all in one go thanks to a simple PARCP script. But I am sure it can be used for all sorts of other things, including packing and unpacking files or who knows what else you can come up with :-)