Linux has a kernel module called fuse which provides a user file system - basically it's the same as tclvfs but implemented at the linux kernel level. The linux fuse module and utilities can be found at http://fuse.sf.net and is required for this tcl package to function.
I (CMcC) have written a tcl interface to fuse version 2.2. A preliminary version can be found here: [L1 ].