It would be prefferable to have something like Temporary Visibility Flag in operator properties which works just like Visibility Flag, but it is
unique for the pane, thus when rendering only Visibility Flag should influence on visibility, and when modeling and viewing a scene in viewport the determining is determining Temporary Visibility Flag. Temporary Visibility Flag is established in the same way and corresponding to Visibility Flag by default, but the user at any moment could establish Temporary Visibility Flag of any operator. Thus, that would be possible to paint attribute tension in one pane, and to see its influence on a placement of a structure on models in the other one. Or i to see low poly geometry in a viewport, and in the other one the subdivided could be viewed.
So, the main target is - to have an opportunity to see the same conditions of one subnet separately in different panes.

Can you set one viewport to display current and the other to display the displayed sop.
Also, try unlinking one viewport and fixing it to view one particular sop.
Plus you can use the footprint flag.

Seems to be impossible to view infra red Paint SOP (with visibility flag on) in one view and textured object (with result of painted tension attribute) in other in one moment. All views will be “infra red”, right? :?

Have you tried ..right click on SOP down the network and ‘Preview Window’? So you can paint stuff in your current viewport and the floating window will show the results on the SOP down the line. Not sure if this is what you're after though..

Adam

A kool idea for the visiblity sop is instead of hiding selected primitives, template selected primitives! This way you could see a greyed out wirframe of how things fit together. 8)

AdamJ, the best there is 8) Thanks!