8. Using Vision Advanced Features
 
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Using Vision Advanced Features
This chapter describes the advanced functions that Vision provides. When you develop Vision applications, you can use these functions to:
Specify more complex queries
Make your applications easier to use
Make your applications more efficient
Vision advanced features include:
Parameters to pass values between frames
Local variables to define hidden fields for a frame
Local procedures to define 4GL procedures for a frame
Global components—constants and variables to set values throughout an entire application, or record types to define your own data types
Escape code that you write to perform additional functions at specific points when you run a frame
To write escape code, you need to be familiar with 4GL. The 4GL part of this guide provides a comprehensive guide to the 4GL statements and their syntax.
Note:  This chapter contains a separate section describing how to use each of the advanced features. However, you can use several of these features together; for example, by writing escape code to tell Vision how to use a local variable. To combine advanced features, refer to the specific sections of this chapter that describe those functions.