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To let applications adapt their behaviour with respect to the (caching) status of a file and the current quality of communication, I have decided upon two primitives that supply these informations.

The $\mathcal{P}$$e$$\mathcal{S}$$t$$\mathcal{O}$ status primitives are:

In Figure 5.8 (though a bit out of place) is an example use of these primitives.