14.1.3 RDML Screen Modes and Mode Sensitive Commands
The DISPLAY and POP_UP commands cause information to be displayed on a workstation. In addition the "mode" in which the information should be displayed can also be specified. Currently screens can be displayed in 4 different "modes" that are referred to as:
*DISPLAY mode
*CHANGE mode
*ADD mode
*DELETE mode
The processing mode which is in use when a DISPLAY and POP_UP command is executed affects:
Whether or not fields on the screen can be changed by the user.
The function keys that are enabled.
The processing logic that is used by the DISPLAY and POP_UP commands.
The screen mode can be set / changed by using the SET_MODE command and can be tested using the IF_MODE command.
Also See
Modes and Fields that Can Be Changed