Predefined STN Variables
In addition to predefined logon setup variables, other variables related to your STN session are available to you.
_$CENV
the current STN file environment (a list of STN files in capital letters)
_$ENUM
the current E-number
_$LANS
number of answers in the most recent L-number
_$LNUM
the most recent L-number
_$LENV
the STN file environment on entry to the script
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