


I have encountered a problem with 
the Fred-window-function (set-window-filename).  Namely,
(ask window (set-window-filename "string")) causes an error:
NIL is not a correct argument to ::CCL%string-length (approximately).
However, the filename attached to the window is correctly set to 
"string."  Somehow, I think I am doing something wrong, and that it is
not a bug.