you can use all sorts of meta tags on the page but none of them are a rock
solid solution. i don't honestly think there is a reliable way to prevent
the user clicking back. although you can figure out if they are re-posting
a form.
you can put in this javascript code to make sure that an attampt to go back
is never successful, provided the user has javascript enabled.
history.forward();
if there is a forward item in the history, it will go there immediately. to
put it another way, if someone clicks back then the above code should boot
them forward. i think this should prevent re-posts of the form.
some banking web sites use form submit buttons on the entire site, no
hyperlinks anywhere, and they can then do a server-side check on every page
and if there is a re-post then it is picked up and they get automatically
logged off. this is a very harsh approach but as a user you quickly learn
to avoid using the back button. not sure if this would suit your target
users who may be one-off visitors.
hope this helps
tim
