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:
The processing mode which is in use when a DISPLAY and POP_UP command is executed affects:
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