Initializing help system before first use

# Editing Source Files

In this section you will edit some of these files to add functionality to the app.

## Editing Mosel Files

When you use Xpress Workbench to create a new Mosel project, a correctly structured Mosel model file named `model.mos` is automatically generated in the project folder. This model file provides the basis for your model creation.
Note: Xpress Workbench supports code folding, auto-completion, and syntax highlighting in the Mosel language. For more see Coding Assistance.

## Editing Insight App Source Files

Every new Xpress Insight project contains the files for a minimal Xpress Insight app. Developers can use Xpress Workbench to create visual applications hosted in Xpress Insight, known as Views, that enable non-technical business users to interact with optimization models, such as those written in Mosel, and perform in-depth what-if analysis.

Business users work with underlying models using visual components and business terms to specify values for the scenarios they are exploring. Scenarios can be iteratively developed and executed, and their results analyzed.

Xpress Workbench provides the View Designer to enable rapid development of these custom views by allowing you to associate user interface components with model data for viewing and editing.

For more see Using the View Designer and VDL to Create Custom Views

Parent Topic First Steps

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