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=== Interface ===
There are two fundamental issues in component and interface-based programming, :* lifetime (aka object ownership) and * interface querying (identifing components at run-time).
These issues are addressed by the nsISupports interface that every XPCOM object should implement.
The nsISupports interface is similar to the Object and other run-time interfaces built into Java and .NET.
The following is a simple example of an implemented nsISupports interface for the class Sample.
nsISupports interface is explained well [http://www.mozilla.org/projects/xpcom/book/cxc/html/quicktour2.html#1003494 here].
== Related Links ==
*https://addons.mozilla.org/firefox/2230/
== Examples Resources == Links to Newsgroup:* [news://news.mozilla.org/netscape.public.mozilla.xpcom mozilla.xpcom newsgroup] Links to IRC Channels: * [irc://irc.mozilla.org/developers #Developers]