We're planning on a porting project from client-server to
browser-based. The client-server application has a
critical built-in security mechanism we'd like to bring
over to a web browser. It reads from a set of control
files on the hard-drive to make sure it is being run from
an "approved" computer.  Can something equivalent to this
be done in a browser-based application? The usual USER
NAME/PASSWORD is not good enough for us. In other words,
does any one know how you can "tie" a web site to a
particular computer?

I'm wondering if there's a way I can setup/configure the
browser on my users' computer so the user can only access
my app from that particular PC. All my users are in the
same city and there're only a handful of them so we can
visit them all if we have to. After I set the user up, I
want the user to "magically" get to my site when on that
approved computer, and "magically" fail to from any other
non-approved computer (because it not have my hidden
stuff). I know there're certain limitations as to what a
browser can do.  What kind of system information is
available to a web-browser and what directories on a
computer the browser has access to, in addition to the
cache directories?

Thanks in advance.