>Is vfp suitable for it ? Or there is a much more suitable language for
>this kind of application. ?

I've done POS in VFP, and it seemed quite reasonable. I'd just like to point out the OLE for POS specification, which allows you to abstract your hardware one level (IOW, if you're using an Epson receipt printer, and your client is using something else, you aren't in big trouble...). You should be able to find information about it by drilling down on www.microsoft.com:Industry:Retail.