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The last form of privileged access to traffic flow within a region occurs when &INTCMD and &INTREAD statements are used to execute commands or other NCL processes within an NCL dependent processing environment.
When a procedure executes an &INTCMD statement, command results are returned to that procedure. These results are queued and can then be read back by the original procedure through the &INTREAD statement.
&INTREAD therefore provides privileged access to the flow of command result messages produced by the various commands and NCL procedures that execute within the original procedure's dependent processing environment.
&INTREAD is also able to access unsolicited messages, such as monitor messages, for which the independent environment is profiled.
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