Changes the workstation that plots will be drawn to.
The identifier returned from calling Ngl.open_wks.
This procedure changes the workstation (output device) that a PlotId's object will be drawn to. The first argument is a plot id and the second argument is a workstation id returned from a previous Ngl.open_wks call.
For an example on changing the output device from an X11 window to an NCGM file, a PS workstation, and then a PDF workstation, see ngl08p.py.