Once a schema has been validated or compiled in ACGUI, the ASN.1 Tree window provides an interactive view of the ASN.1 types defined in it. At the top level of the tree, the modules of the schema are shown. Each of these modules can be expanded to reveal branches for the types, values, information objects, etc. defined in each of them. Clicking on any node of the tree will show the relevant ASN.1 definition in a built-in browser in the editor window.