Java 6 Update 12 64bit Java Webstart documentation

Question

I notice that 64bit 6 Update 12 comes with 64bit version of Java Webstart - I am just wondering whether there are any documentation on how 64bit Java Webstart works? For example:
1) By default it will use the 64bit JRE to launch an application. What if an JNLP embedded some 32bit JNI DLLs that requires the use of 32bit JRE?
2) How can an app specify larger heap if it runs on 64bit host, but less on a 32bit host?
3) Is there any new extensions to JNLP to support 64bit Java?
Thanks.

Answer 1

1.) The initial release of the 64 bit version of javaws will work only with 64 bit JRe's. There is no support yet for mixing.
2.) You can specify different dlls for use with 64 bit and 32 architectures just as you can with operating systems as follows:
<resources>
<java version="1.6+"/>
<jar href="myapp.jar" main="true"/>
<resources os="Windows" arch="i586">
<nativelib href="mydll32.jar"/>
</resources>
<resources os="Windows" arch="amd64">
<nativelib href="mydll64.jar"/>
</resources>
</resources>
3.) There are no new JNLP extensions.
/Andy