20. Writing 4GL Statements : Forms-Control Statements
 
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Forms-Control Statements
A 4GL application involves the display and manipulation of data that the application user sees on forms in the window. Through forms-control statements, you can manipulate both form fields and local variables. You can use forms-control statements to:
Position and move the cursor on the form
Set the display mode of the form
Clear the screen or clear individual fields
Provide help text, display messages and prompts
Validate data fields
Manipulate individual table field rows or array records
Process an entire table field or array at once
Display additional operations on submenus
You can include forms-control statements as part of initialization or place them throughout the 4GL specification.