Workstation routines
| Ngl.change_workstation | Changes the workstation that plots will be drawn to. |
| Ngl.clear_workstation | Clears a specified workstation. |
| Ngl.delete_wks | Deletes a workstation object. |
| Ngl.frame | Terminates a picture on a specified workstation. |
| Ngl.open_wks | Opens a workstation on which to draw graphics. |
| Ngl.update_workstation | Flushes all output to a specified workstation. |