PLS_Toolbox documentation is contained in various documents including:
PLS_Toolbox Manual - containing the chemometrics tutorial and how-to use PLS_Toolbox functions and GUIs.
PLS_Toolbox Reference Manual Addendum - addendum to the PLS_Toolbox Manual.
PLS_Toolbox Reference Manual - a single document containing all of the detailed function I/O and their use.
DataSet Object Manual - a technical description of the DataSet Object (see also the PLS_Toolbox Manual).
These documents require the Adobe Acrobat PDF Reader which can be downloaded FREE from the Internet.