ProgID

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ProgID (short for PROGrammatic IDentifier) is a COM term, which is basically a string like "msxml2.domdocument" to represent an underlying CLSID which is something like {F9043C85-F6F2-101A-A3C9-08002B2F49FB}.

It is also used to express binary code compatibility between two COM objects.

http://www.vbaccelerator.com/progid.htm