In system `29.95 NWS, with microcode 669, on LISP Machine Eight: ZWEI considers FOO > LUSER; AI: and FOO > LUSER; DSK: to be different files and buffers. I.e. if I have one in a buffer and try to get back to it by C-X C-B or C-X C-F specifying the other, it tries to read the file in again.