Answer Posted / murray

The PDV can also contain user invoked temporary variables
such as IN, END and FIRST.by and LAST.by.

In a nutshell, IN indicates if an observation originated in
a specified input data set, END indicates if an observation
is the last observation in a specified input data set, and
FIRST.by and LAST.by indicate if an observation is either
the first or last observation of any specified BY variables
(the data set must first be sorted accordingly). See SAS
help for more details.

These automatic vars (_N_ and _ERROR_) and temporary
variables are not written to the output data set, however
their values can be assigned to user defined variables.

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