I have in the past changed some of my site's page file names
and noticed,for months, 404 errors in the log of site activity with user's trying to still load the old file names. From following this group I assumed it was a case of an old cache of my site being used by a surfer somewhere
maybe not even using Google but some other SE. I have been
reluctant to change file names because of this even though
the percentage of overall users is small. Still that small
number may have included the rarest of all surfers, a buyer,
and there are ideas I've had of stressing different key words and so the question arises if there is a way to have
the same file content under say, two or three different
names? If I had all but one of the names on the robots.txt
list would that persuade Google this wasn't some Spam idea?
Just today I noticed about 300 or so 404 errors where
someone was trying to load pages with the file names all in
lowercase letters (yes, I unfortunately originally used
some capital letters when I designed the site) so here is
another case where it would be nice to be able to include
a duplicate set of site pages with file names in all lowercase letters.