Sorry about the double posts, as I reposted as I didn't see the
message come up "momentarily" as the notice said when I post.

I'd still like to know which VM to install for Swing in IE (as
explained in the previous 2 posts). Can someone help?

Thanks.

Note that we should not have to care what IDE you
are using.  That is irrelevant.  What is relevant are
the compile time options used to build the project.

That is relatively easy to do (compile with options), in a
'cross-IDE' way, by using an Ant build script.

What does this interface do?  Can it work in a
sandboxed environment?

What does 'IE' have to do with it?  Do you want this
applet to work -
- On one single machine running IE?
- On a small group of machines all running IE?
- On the internet, in browsers?

In any case, if you did not use any cross-compilation
options, the only guarantee is that the code will run
on JRE's with a version number equal to (or presumably
greater than) the SDK version that built it to bytecodes.

Cross-compilation options (along with a suitable rt.jar
for the bootclaspath) might be able to compile the code
compatible as far back as 1.2 - it depends on what Swing
members (components, methods, attributes) are utilised
in the GUI Design.

Note that once the minimum Java version is dsicovered,
it is far easier to enforce that minimum version using a
web start launch.  Examples..
<http://www.physci.org/jws/>

Ptui!  Use Ant and stop worrying about
your precious IDE.

Depending on your end-users, its often best to install the latest
stable version of the JDK for development, and the latest stable JRE
for usage.  I believe today that is Java 1.6.  Although, Java 1.5
should be safe enough.