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All of these examples assume that the library has been imported as noted in the Documentation.
As noted system objects (those objects automatically defined by the system) can be enormous in their scope. You should always use the MaxRecurseLevel when working them to prevent instability: never assume that a system object is "simple" until you've first checked it out!
Style objects contain all of the style information available to script. They are "flat" object and so we can safely dump them without the MaxRecurseLevel argument. Here we get the current style information for the BODY tag:
The images array is another monster. It contains references to every image on the current page (and every reference contains references to many other objects):
There are special facilities to handle cookies and the query string (note that this page probably does not have any query string variables defined):