Vision automatically generates the 4GL code that runs your applications. This 4GL code is based on standard SQL. (Vision does not support QUEL-based 4GL.) If necessary, you can edit the 4GL code for a specific type of Vision frame called a User frame.

You can add functions to the Vision frames by writing 4GL statements and expressions called escape code. You can also modify the Vision template files or add your own 4GL code to perform specific functions.