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[newbie] Bunch of questions about COM

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Hello,

I have several newbie questions about COM:
  1. What is an interface?
  2. Is a new GUID generated every time a COM object is recompiled, so as to tell versions apart?
  3. For backward compatibility, must each new version of a COM object contain at least all the methods and properties from the previous version?
  4. Can multiple versions of a COM object co-exist on a computer?
  5. Can I prevent an application from installing an older version of a shared COM object so that my application doesn't break?
  6. Is there an application that can list an object's methods and properties, or is the object's documentation the only reliable source of info? I tried the OLE/COM Object Viewer and also RegDllView but they don't seem to provide that feature


Thank you.

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