What programming model first released in 1991 can be used to write applications for the OPOS API?
OPOS:  The standard uses component object model and, because of that, all languages that support COM controls (i.e. Visual C++, Visual Basic, and C#) can be used to write applications. Visual Basic: Visual Basic is a third-generation event-driven programming language and integrated development environment (IDE) from Microsoft for its Component Object Model (COM) programming model first released in 1991 and declared legacy during 2008.
i don't know