|IDL Reference Guide: Overview of IDL Syntax|
Some of the code examples used in this manual are part of the IDL distribution. Referenced files are located in the
examples/doc subdirectory of the IDL distribution. By default, this directory is part of IDL's path; if you have not changed your path, you will be able to run the examples as described. See !PATH for information on IDL's path.
IDL Online Help (March 06, 2007)