The system can be used as an input device for computers. Computers can interpret the hand movement as a mouse movement. This also can replace the way how we type through a keyboard, by following and recording fingers movements to detect what letter they pressed (On a virtual keyboard, maybe) or people could simply move their finger as they normally write with a pen, and the system can detect what letter they are writing and write it down!
People can also have collaborative working environment by creating more than one virtual keyboard and start working and typing into a document! This is also possible with drawing, designing, modeling and any kind of collaboration needed.
This will open a new whole level about how operating systems and programs can be developed with the 3rd Dimension implemented and how people can move around with the operating system.
This system also can replace mouse, keyboard, and the costly Multi-touch screens!