CAN YOU SHARE A USB WEB CAM?? IF SO WHAT SOFTWARE SHOULD I GET TO DO SO??

THE REASON I ASK IS BECAUSE I WORK IN A COMPUTER STORE AND SOMETIMES DON'T KNOW THAT THERE ARE CUSTOMERS AT THE FRONT DESK.. SO WE WERE GOING TO HOOK UP A WEB CAM TO OUR FRONT DESK COMPUTER TO WE CAN MONITOR IT FROM THE BACK ROOM TO SEE WHEN SOME ONE COMES IN THE STORE.. PLEASE HELP!!