There are now available a range of PVC card printers which support printing on both sides of the badge. Eltron, DataCard, Magicard, Atlantek and Fargo, among others, now offer such printers.
These printers have available a range of ribbons configurations which allow color on both sides, or color on one and black and white only on the other. These printers can also be used to print single-sided badges.
Generally, the printer driver provided by the printer manufacturer is used to determine how the printer is to respond to double-sided printing. You should check the printer set up within the Windows environment to determine what capabilities are available and how to use them. You will probably find a control which turns duplex (ie: double-sided) printing on and off. There may also be control of the orientation of the back with respect to the front and whether or not color is available on the back.
This program has been tested on printers from the previously mentioned manufacturers and found to be fully operational.