In ZWEI in System 98.43, CADR 3.6, ZMail 53.14, MIT-Specific 22.0, microcode 309, ZM MIT, on Lisp Machine Eighteen: M-X List Sections may show at the top "Buffer Header" or "Things Deleted". If you put the mouse on them, the who-doc line suggests you can click left and edit them -- but if you try you get an error.