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Following structure is used (by Communicator) :
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1. If this is the first script that has been seen on the page, assign this script's principals to be the principals for the window.
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2. If the innermost container (the container directly including the script) has defined principals, intersect the current script's principals with the container's principals and assign the result to be the principals for the container. If the two sets of principals are not equal, intersecting the sets reduces the number of principals associated with the container. Done.
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3. Else, find the innermost container that has defined principals. If the principals of the script are the same as the principals of that container, leave the principals as is. Else assign the current script's principals to be the principals of the container.
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