After looking at your screenshot, I just click on the specific sandbox, and do a run program, then window grid ran inside that specific sandbox now, wrapped with your sandbox yellow frame. This means it should be able to start its own process with each sandbox. It would have been nice if it can resize your sandboxes from outside, then I can stag multiple sandboxes using just one windowgrid process. Thank you.
However it looks like windowgrid overlayed the sandbox, I can see the app, but cannot access the app. I will try to run windowgrid first, then run the app, lets see if that will work.
UPDATE:
(1) Tried running windowsgrid first, then the app, work on first one, but not the others. Actually to be exact, the first one always work regardless which app starts first, but not the others. If I try shutting down windowgrid, the whole sandbox will crash.
(2) Tried to run windowgrid on first sandbox, then the app, resize and placed on a grid, then close windowgrid. Repeat same step with second sandbox, except place on different grid, then close windowgrid. This works, though a bit sluggish, but workable. I'll try to see how many I can open with that sluggishness.
If I have small exe that I wish to run only once, or constantly running, I should be able to use the same method, correct?