The easiest way to transfer CafeTran project to another computer is as follows:
1. Convert the project to package via the menu Project > Convert project > To Package...
2. Drag and drop the package .ctp file onto the Project Dashboard in the second computer.
Good question. I've always done it via the Project menu, but that was before the Dragging was added. Guess that dragging will work too. However, you won't be able to proceed directly from the segment number where you stopped on the other computer (or is this not true with CafeTran's own XLIFF files?).
And then there is this problem with syncing non-translatables, your custom dictionary etc. etc.