External
files are files that contain data or text, such as SAS programming
statements, records of raw data, or procedure output. SAS can use
these files, but they are not managed by SAS.
SAS Language Reference: Concepts contains basic, platform-independent information
about external files.
For information about
how to access external files containing transport data libraries,
see the SAS Customer Support Center Web page, http://support.sas.com.