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System variables represent read-only information that is available to all procedures in the system. These variables cannot be modified by procedures and the information in the variable is either constant (for example, &TIME always contains the current time, regardless of which procedure references the variable) or procedure-dependent (for example, &LUNAME always returns the name of the terminal associated with the NCL region in which the procedure is executing).
The system variables documented are general purpose variables available to all NCL procedures unless specifically noted otherwise. There are also special system variables that occur only on completion of certain verbs and that provide message profile information.
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