Sentinel SuperPro/Sentinel C Keys..need a "dongle"

I am a 50 year old housewife who had polio and I am homebound and my husband said it would be fun for me to learn to draw. I purchased used C & G software for my husband to surprise him for his birthday but when I loaded it...it doesn't work. It had a manual with it. I am not computer literate but I am trying to learn. It said something about a dongle. I don't know what a dongle is but I think I need it. He uses microstation, eaglepoint and softdesk at work but I thought that this C&G program might be something he would be interested in but it doesn't work. Does anybody know where I can buy a dongle (whatever that is) for C & G version 14.24 to have it at home as I could not afford to buy the other kinds of software he uses. I think I got a good price and would like to get it installed and working before his birthday. The C & G is version 14.24. Does anybody out there have a spare dongle for C & G that I can buy? Please contact me if you do...and how much do they cost? My email address is REM Landshark @ aol.co