A host application is the application in which a form exists at any given time. For example, if you are using LiveCycle Forms ES to render a form in HTML format, then during the pre-rendering process the host application is LiveCycle Forms ES. Once you render a form and view it in a client application such as Acrobat, Adobe Reader, or an HTML browser, then the client application becomes the host application.
LiveCycle Designer ES includes a scripting model that provides scripting properties and methods for directly interfacing with a hosting application. For example, you can use the properties and methods in the host scripting model to provide PDF page navigation actions in Acrobat or Adobe Reader, or you can use the
importData method to load data into your form.