| User interface / Display of static information | |
The values contained in program variables can be displayed to the current form with the DISPLAY BY NAME or DISPLAY TO instruction. Forms can be cleared with the CLEAR FORM or CLEAR field-list instructions. Complete record lists (in SCROLLGRID, TABLE or TREE containers) can be cleared with the CLEAR SCREEN ARRAY instruction. Application messages and warnings can be displayed to the user with the MESSAGE and ERROR instructions.
The DISPLAY BY NAME/TO instructions are not interactive, and are usually not needed if the program is always in the context of a dialog controlling the form fields: The data of the program variables will be displayed in form fields when the dialog starts, if the WITHOUT DEFAULTS option is specified, and during the dialog execution, form fields will be automatically synchronized with the program variables when using the UNBUFFERED option.