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IOS.sh fetch command. What does it fetch?

In the IOS shell, there is a command "fetch" (ie, in the terminal shell). The help says:

 

NAME
fetch - return data from a path variable.

SYNOPSIS
fetch <var> <path>

DESCRIPTION
Fetch returns a string from an internal path element
Path elements contain internal operational data

 What are these internal path elements? I cannot find any example of this being used.

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