What is the difference between block keys and page keys in CIS data mappings?

Block keys are identifiers for Clintrial blocks, which correspond to Central Designer study events and InForm visits. Page keys are identifiers for Clintrial pages, which correspond to Central Designer and InForm forms.

All data that is synchronized to Clintrial must have a block key and a page key associated with it. The context panel in a Clintrial study contains items that hold the values of the block key and page key. These items are called the block key item and the page key item.

In Central Designer, the data series in the data set that is marked as the context panel (the value of the Panel Type custom property is Context Panel) identify the block key item and the page key item.