SWF Loader & Flex's SWFLoader: child SWF sandboxing policy

Question

REF: http://livedocs.adobe.com/flash/9.0/ActionScriptLangRefV3/flash/display/Loader.html

With regards to a parent SWF loading a child SWF via the Loader class, is it possible to prevent the loaded child SWF from:

• Making any network calls, or
• Making calls to specific domains

Basically, I'm looking for a programmatic version of allowNetworking: http://livedocs.adobe.com/flash/9.0/main/wwhelp/wwhimpl/common/html/wwhelp.htm?context=LiveDocs_Parts&file=00001079.html

Aditionally,

1. Are there any Flash Player version and Actionscript version discrepancies?
2. Are there any discrepancies if using Flex's SWFLoader is used instead?

Many thanks,

Geoff