>>> L: works under LaTeX >>> OL: works under LaTeX 2.09 >>> P: works under plain TeX >>> X: support application, OS specific > >+:= E1: requires e-TeX V1 > E2: requires e-TeX V2 > On: requires Omega Vn... This sounds like the \NeedsTeXFormat{FooBar} command that is already in use in LaTeX. I can mention that a big Mac archive has so far refused to split up its contents into two different 68k/RISC archives, because it is difficult to maintain. Its contents is only classified according to topic. If all archived files are required to contain a \NeedsTeXFormat{FooBar}, perhaps a more advanced archive search can help the user to find what is desired. Hans Aberg