OPOS and Windows printer driver

Got it via google , Thankyou.

OPOS was the first widely-adopted POS device standard. It was initiated by Microsoft, NCR, Epson, and Fujitsu-ICL to help integrate POS hardware into applications for the Windows™ family of operating systems. OPOS uses COM technology, and is therefore language independent.

OLE for Retail POS consists of: An architecture for Win32-based POS device access. OPOS is currently deployed on Microsoft Windows 95, Windows 98, Windows ME, Windows NT, Windows 2000, Windows XP, and Windows CE. A set of POS device interfaces sufficient to support a wide range of POS solutions. Release 1.6 includes 21 device classes.

OLE for Retail POS Controls adhere to the ActiveX Control specifications. They expose properties, methods, and events to a containing Application. The controls are invisible at run time, and rely exclusively upon the containing application for requests through methods and sometimes properties. Responses are given to the application through method return values and parameters, properties, and events. The OLE for Retail POS software is implemented using the layers

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