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:
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*DISPLAY mode
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*CHANGE mode
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*ADD mode
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*DELETE mode
The processing mode which is in use when a DISPLAY and POP_UP command is executed affects:
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Whether or not fields on the screen can be changed by the user.
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The function keys that are enabled.
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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