step 1: Obtain a demo code
Choose a product: you've to re-fill the form for each different product you want to download DBWorks for SolidWorks DBInventor for Autodesk Inventor DBSolidEdge for Siemens SolidEdge Mechworks StandAlone Client (MSOffice, AutoCAD, Draftsight) WebClient
You'll find a link to documentation modules in the download page.
step 2: Submit the received demo code