Terminal number returned by TNMBR
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WSupported on Windows
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USupported on Unix
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VSupported on OpenVMS
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System option #17 controls how the deprecated %TNMBR routine determines the terminal number.
On OpenVMS, if you set option #17, %TNMBR uses the physical device to determine the terminal number for a virtual terminal. If you don’t set option #17, %TNMBR returns a number based on the VT device specification for a virtual terminal.
