Release 10.1A: OpenEdge Development:
Progress 4GL Reference

> ## WINDOW-SYSTEM attribute

> A value that indicates the windowing system the application is using.

> Data type: CHARACTER

> Access: Readable

> Applies to: SESSION system handle

> Progress sets the value of WINDOW-SYSTEM as follows:

> - In Windows 95 and Windows NT, in graphical interfaces:

> - If the Windows 95 shell is running, the value is MS-WIN95.
> - If the Windows 95 shell is not running, the value is MS-WINDOWS.
> - In character interfaces, the value is TTY.

> Progress supports an override option that enables applications that need the WINDOW-SYSTEM attribute to return the value of MS-WINDOWS for all Microsoft operating systems to do so. To establish this override capability, define the WindowSystem key in the Startup section in the current environment, which might be the registry or an initialization file. If the WindowSystem key is located, the WINDOW-SYSTEM attribute returns the value associated with the WindowSystem key on all platforms.

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