I am writing a HTML page and I would like to know which language/s to use.
The requirements are:

1. The database will need to be created / written to using data
collected from an application written in c++ or vb (I think that?s any
database)

2. The database will need to contain queries and also be sorted,
queried from within the html page and contain relationships. (Does XML
even handle relationships?)

3. The database will need to be stored client-side and therefore
accessible offline (Is ASP.NET/PHP server-side only?)

4. The "package" will need to be widely available. For example if I
use an Access database or the .NET framework, will 90% of people still
be able to use it? Do they need the .net of MS Access installed?

5. I don't want a message from IE6 saying that the page is insecure
like it does in my test version which uses VBScript to collect
information form the database file on my computer. (I am stuck on this
one because is not a HTML page accessing a database file on my
computer always a security risk? Yet I have seen other pages that
achieve it. Such as Google's desktop search, which has a page that
opens in IE and searches the client-side index file, and does not
produce any warnings? The page address looks like this
"http://127.0.0.1:4664/&s=")

Thank you for your time.