% Philip Taylor writes:
%  > >>   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...
%
% shall we just let the authors provide this clue? rather than trying to
% test it independently?

d'accord.  ** Phil.