hi to all!

i've been developing a POS System in a small retail store, and my problem is how to control programmatically the cash drawer? What i did for the meantime is to issue the DOS Shell about controlling the COM1. and it was successfully to open the cash drawer. but my second problem is how to detect if the cashier close drawer. What command normally is to use to capture the closing and opening of the cash drawer?.

Thanks.

Holden