Enable or Disable Extensions
Whether or not the X server supports extensions sometimes affects client behavior. Clients may paint better, run faster, or avoid other problems by changing which extensions are enabled.
To enable or disable extensions from X Manager or the Administrative Console
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(Administrative Console only) Click the Domain Definitions tab.
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Under Session Definitions on the left, select a session definition.
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Click the Extensions tab.
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In the Available Extensions list, select or clear extensions as required.