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Screen Refresh Options.
| Constant | Value | Description | 
|---|---|---|
| enumSCREENSHORTUPDATE | 0 | Issue a screen update request. | 
| enumSCREENQUICKUPDATE | 1 | Issue a quick screen update request. | 
| enumSCREENFULLUPDATE | 2 | Issue a full screen update request. | 
| enumASYNCHRONOUSUPDATE | 3 | Issue an asynchronous screen update request. | 
| enumSCREENFULLREDRAW | 4 | Issue a full screen redraw request. |