ATTENTION! Light show. Computer parallel port can be used for many purposes. One of them could be user circuit control, for example light effect. , as all other schemes are located on the sites of their rightful owners. We are not liable for the contents of other sites as well as the site having a circuit Light show. Computer parallel port can be used for many purposes. One of them could be user circuit control, for example light effect. . Pressing the button you must get onto a page with Light show. Computer parallel port can be used for many purposes. One of them could be user circuit control, for example light effect. .