IOGear GCS1804 - Manual (Page 26)

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OSD Overview
The On Screen Display (OSD) is a menu driven method to handle control and switching operations.
All procedures start from the OSD Main Screen.
To Access the OSD (default) :
1. Hold down the Num Lock key
2. Press and release the minus key
3. Release the Num Lock key
When you invoke the OSD, a screen similar to the one below appears:
OSD Operation