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A screen wrapper can pick values out of hidden 5250 screen(s) and present it in completely different ways. This example shows the disk usage of a IBM i graphically:
 
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To access the work with disk status screen type wrkdsksts in the command line. The name given to the Work with Disk Status screen in this example is "DiskStatus".
When in the disk status screen, read the %Use column of the subfile and feed the data to the graph.
 

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