Up to now it was always needed to download the software package to receive documentation regarding features.
Starting with WinCC Open Architecture V3.18 an online version of this documentation will be available offering quick ways for look-up wherever you are. No installation needed to learn more about WinCC OA. This online help is set up in English as well as in German and can also be used for prior checks on functionality.
Online Documentation V3.19 (English)
Online Documentation V3.19 (German)
Online Documentation V3.18 (English)