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Processing environments can operate in a hierarchy, so that there can be many processing environments associated with the same window. This is achieved by using the &INTCMD NCL verb.
Every NCL process executing within an NCL processing environment can establish a dependent processing environment (using the &INTCMD verb) in which other NCL processes can be invoked to execute on behalf of the higher level.
In turn, an NCL process executing in a dependent processing environment can establish its own dependent environment, forming a hierarchy of dependency and allowing any NCL process to invoke chains of other dependent processes on its behalf.
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