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Startup Command and Parameter Reference
Startup Parameter Descriptions : Windows Single Session (-wss)

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
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 OpenEdge prior to Version 9.0.