Language Reference Guide : System Classes : SessionObject Class : WindowSystem Attribute
 
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WindowSystem Attribute
Data Type: integer
4GL Access: R
The WindowSystem attribute specifies which window management system is currently in use.
Valid settings are:
WI_MSWIN32—Windows graphical user interface
WI_NONE—Batch execution
WI_MOTIF—OSF/Motif
Descriptions of system constant values and their numeric equivalents are listed in Window System Settings for SessionObject.
For more information, see Cursession.WindowSystem in the Migration Guide.