debian lenny benutzt xml bei pam-mount
FunionFS means an Union filesystem for the FUSE driver.
Do whatever you like, install, change and remove files from the system, and no harm whatsoever. Your real system stays untouched. This may sound like magic, but is in reality just possible by combining some techniques from all those available for Linux.
ein neues union-fs (z.b. benutzt von knoppix)