Frame navigation in NCL

Dear all,

I'm a newbie with both WRF and NCL, and so far I'm very impressed.
Just two simple questions so far:

1. When running a typical script, one goes to the next plot by
clicking on the window. How does one go back? I should say that I'm
running NCL on a Mac with X11. Whichever button I press, I can only go
forward in the plot "stack".

2. In a WRF context, is there much to be gained from running RIP
rather than NCL?

Thanks in advance for your time and answers.

-- 
Erik W. Kolstad
Bjerknes Centre for Climate Research
University of Bergen, Norway
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