The actual variable used in a scene via SDL is located in the STRINGS section.

http://wiki.povray.org/content/Reference:Strings

Built-in Variables
At the moment there is only one built-in string variable. You can use it to
specify values or to create expressions but you cannot re-declare it to change
it's value.

File-related are:

STRING_BUILT-IN_IDENT:
  input_file_name
input_file_name
The name of the scene input file.

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