Release 10.1A: OpenEdge Getting Started:
New and Revised Features

New WINDOW-SYSTEM value

OpenEdge Release 10.1A provides XP Themes support that automatically adapts to the current display environment, even if you switch the display mode in the middle of a session. If you want to further customize the look of your application, there is a new MS-WINXP value for WINDOW-SYSTEM.

Note: WINDOW-SYSTEM in this context refers to both the WINDOW-SYSTEM session handle attribute (for determining the windowing system at run time) and the corresponding variable for the &WINDOW-SYSTEM preprocessor (for determining the windowing system at compile time).

WINDOW-SYSTEM is set to MS-WINXP when the OpenEdge executable (either prowin32 or prowc) is running with a manifest file and the XP theme style is the current display setting. Otherwise, it is set to MS-WIN95 or MS-WINDOWS as before (the XP classic interface is considered a Windows 95 interface, so WINDOW-SYSTEM returns MS-WIN95 if a manifest file is not used or if the XP display is set to the classic interface).

Note: The WINDOW-SYSTEM value changes if the user changes the display style while OpenEdge is running.

If you have any existing application code that depends on the MS-WIN95 value, you must revisit and modify this code to work appropriately with XP. Alternatively, you can override the WINDOW-SYSTEM value by setting WindowSystem = “MS-WIN95” in the [Startup] section of the progress.ini file or registry. Then you do not need to make code changes, and your application can still make use of the manifest file (but you cannot use WINDOW-SYSTEM to determine whether the manifest is active or not.)