The <DATA> file handle makes it possible to read the __DATA__ section at the end of the program, i.e. in this case: 
__DATA__
(1) Preface

What is this all about.

(2) Summary of Significant Accounting Policies

Revenue Recognition

Revenue is recognized at the time goods are sold and shipped.

(3) Long-term Debt

[download]
It simulates another file and it is a way to quickly test programs without having to create a separate test input file

In reply to Re^3: Making a variable from a number in front of a string by Laurent_R
in thread Making a variable from a number in front of a string by porsche5k

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