Release 10.1A: OpenEdge Deployment:
Startup Command and Parameter Reference

> ## Windows Single Session (-wss)

> Use Windows Single Session (`-wss`) to limit a user to running only one OpenEdge client session at a time.

> Operating system and syntax | Windows | `-wss`
> Use with | Maximum value | Minimum value | Single-user default | Multi-user default
> Client Session | – | – | – | –

> This parameter applies only to a Windows GUI client. If an existing OpenEdge session is running on the machine when `-wss` is specified, the new session terminates and the windows of the existing session are brought forward to alert the user. To avoid unnecessary processing of other parameters, use the `-wss` parameter first on the command line.

> If more than one OpenEdge application is installed on a user’s machine, do not use the `-wss` parameter else it will prevent a user from running two or more applications at the same time. In addition, the `-wss` parameter does not recognize versions of Progress prior to Version 9.0.

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