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Return lowest and highest modus of current driver
Source position: graphh.inc line 748
| procedure GetModeRange( | 
| GraphDriver: SmallInt; | 
| var LoMode: SmallInt; | 
| var HiMode: SmallInt | 
| ); | 
GetModeRange returns the Lowest and Highest modus of the currently installed driver. If no modes are supported for this driver, HiModus will be -1.
None.
| 
 | Initialize grpahical system |