Toggling between two (and not other) windows

Hello,

I use vim with three windows: NERDTree, MinBufExpl and the "main editing" window. Currently I have tab mapped to <C-w>w which cycles through all the windows. What I really want is tab to cycle between just NERDTree and the main editing window, then shift tab to cycle between MinBufExpl and the main editing window.

How to do that?

Thanks for the help.

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