Optional
aInstancePtr: objectA run time mechanism for interface discovery.
NS_OK if the interface is supported by the associated instance, NS_NOINTERFACE if it is not.
aInstancePtr must not be null.
[in] A requested interface IID
[out] A pointer to an interface pointer to receive the result.
Add an item to the system status bar. Each item can only be present once, subsequent addItem calls with the same element will be ignored. The system status bar holds a strong reference to the added XUL menu element and the item will stay in the status bar until it is removed via a call to removeItem, or until the process shuts down.
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Allow applications to interface with the Mac OS X system status bar.