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I feel that the model is best presented by means of examples, so here goes! This is the example used in [51].

Imagine a client holding a replica of a file, f, in the cache with the associated values $<$$MT_C$=8.00,$CT$=9.00,$CCT$=9.00$>$. This would be the result if the file was last updated (before 9.00) on the server at 8.00, and cached on the client in question at 9.00. At 10.00 (being now) the client opens the file for reading with a command similar to:

open(f,READING,$CT \! B$)