A Mask is a primary data collection tool. That means that its primary objective is to collect from the end user the personal and specific values that will overwrite the variables in an assembled document.
Most of the time, the end user will hand type values into the Instant Database (or click values from drop down lists displaying multiple choice options). But when set up properly, it is easy to import data from Word documents created especially for data input purposes, from Excel forms created for that purpose or from external sources.
Click on any of the above links to learn more, or simply continue reading this Manual. Those topics are discussed next.