What am I doing wrong?

[hohmann@csmil.umich.edu]

I am interested in using the "ccl;", "home;", and "library;" logical
pathnames as defined on pg. 284 of the MCL 2.0 reference manual.
Here is some sample code...

? (full-pathname "ccl;")
NIL
? (full-pathname "home;")
NIL
? *logical-directory-alist*
NIL

Any directions?  Thanks!