Determine whether application is running in (the default) sandbox

I have searched the documentation and lists for the answer to this and have sofar found nothing. If it exists, I apologise and please point me to the relevant page(s).
I have an application which I want to be able to run in two modes, in sandbox (so as not to bother the user with those questions) and, if the user really does want to print/email/clipboard, to give permission. I do NOT control (or want to amend) some of the code which performs these operations, e.g. 3rd party report generator, Javamail, which would seem to exclude use of jnlp runtime API.
1. Is the jnlp API the only way to get JWS to ask the user for permission at runtime? Or is there another combination of <all-permissions>, signing, security properties which I have control over form the jnlp file, which I can use?
2. Anyway there would appear to be no API in jnlp for getting permission to access a socket that the mail (Javamail/Java Activition) requires. Is this correct?
3. Can I tell from the application whether it is sandboxed or not? Part of the problem is that the report generator hangs (its thread stops) when all-permissions has not been granted. If I could tell that the app is in a sandbox, I could inform the user to start the app (or maybe restart it automagically) from a different jnlp file which asks those questions.
Very grateful for any help to get the security of the app clean and presentable for average end users.
Thanks
Charles Whittington

Thanks. And I think I now understand all the issues. But none of it really helps.
Remember I have some jars over which I have no control - and I don't actually know which services they are going to require. For example, the Report Generator fails with some reports but not others and I assume (but I don't know) that this is because it is trying to open a temporary file.
I feel it would be better is the whole question of operating outside the sandbox was addressed by asking the user only when the application tries to do an "unsafe" operation. This way we can do away with the ridiculous proposition that a user is qualified to examine a "verifyable" or "unverifyable" certificate in anticipation of an event of which he has no prior knowledge, Or indeed, asking the developer to code certain operations differently because the app will be running in a sandbox. In fact, I see no function in the JNLP API to ask the user if one can open a remote socket - so one is forced back to the signed certificates and "those questions".
So why not recast the security model so the user is asked specifically about dodgy operations - along with the opportunity to allow similar operations again without asking. This would seem to me to make alot more sense.
Just my 0.02GBP
Charles Whittington

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