The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From OSIsoft, LLC:
Note: This is an enterprise business app that requires PI Coresight 2013, or later. The app is preconfigured to connect to a demo server. Use your phones Settings app to connect to your own PI Coresight server.PI Coresight for the iPhone delivers fast and easy access to your PI System data. You can easily find and view PI System data, enabling you to monitor important information and make decisions from anywhere.To get started, use Search to find displays or specific data items of interest. Later, use Most Recent to look through recently viewed items so you can quickly return to important information.You can manipulate the data you are looking at, for example by adjusting the time range or setting it to update in real-time. Rotate the iPhone to landscape view to get a larger view of a trend.