Here is a "best of" collection of links to manuals and tools for OpenLab CDS ChemStation and EZChrom Editions on Agilent.com, for other instruments refer to Collection of Support Documents on Agilent.com.
Collection of OpenLab CDS ChemStation and EZChrom Edition Resources
OpenLab CDS (Editions) Tips & Tricks, Troubleshooting & Maintenance
OpenLab CDS (Editions) Application Ressources
Chromatography Data Systems on Agilent.com