Application for working in a completely closed and independent environments in one computer. This software was created as a tool for software developers. Poker players use a side-box (sandbox) to simultaneously run several poker rooms from the same software (very important for poker clients as Connective Games). It can be used to run several poker rooms without violating their rules about simultaneous presence at the same table in the same tournament.
The free version allows you to create one sandbox, which means you can run two identical poker rooms. In the licensed version, the number of sandboxes is limited to hardware capabilities of your PC.
The only negative point is that trackers for each room need to run in each box separately. This will not be a problem for very powerful computers.