Java SE (Java Platform, Standard Edition)

Can I exchange information between JavaScript and a JWS application lauched from the same browser session? Scenario would be as follows:

1) Enter URL of web page from browse.
2) Web page displays in browser with a button which will lauch a JWS application. Would like to pass parameter data to JWS application when lauched.
3) Upon existing JWS application, any return values are passed back to browser (hoping JavaScript could read return values).
4) Display return values within browser page (same page if possible).

Please let me know if this is possible or at least some variation (JSP, servlets, etc). Also, please don't ask me about using applets. Just assume I can't use them.
Thanks for any help,

SLS