Why is XMLRequest optional in non application sandbox?

Hi everyone,
what does optional mean in this box below found at
http://labs.adobe.com/wiki/index.php/AIR:HTML_Security_FAQ#How_would_someone_code_in_this_ new_model.3F??
Capability
AIR Application Sandbox
AIR Non-application
Can    execute cross-domain requests (XMLHttpRequest)?
Yes
Optional
what does optional mean?? do you have to set the non aplication sandbox up in a certain way in order to allow for XMLHttpRequests?
Thank you all in advance
IrishAIRMax

Interesting question - thanks for asking it.
-Chris

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