these are the two entries in the concept index. I know, but that's not the point. The point, which I admit I failed to express clearly, is that it doesn't make sense to index a widely-used concept in a place it is merely mentioned in passing, not explained (and it shouldn't be explained there).
\newcounter{toto}\setcounter{toto}{2}{\setcounter{toto}{3}}==\thetoto== will output ==3== Wow. Yes, something to be written. I did the mistake as I thought that we had merged these two indices as you wanted to do that. It's true that in general I prefer to have one index, and I don't see any great advantage to two indexes for latexrefman. However, the way to do that in Texinfo is to use @synindex or @syncodeindex; that way, the "proper" index command can still be used. Thanks, Karl