title: POS development on windows: OPOS via COM? OPOS for .Net? UnifiedPOS? ...?
body: <p>I plan to develop a POS system from scratch, which will be based on windows (currently XP SP3). I tried to get an overview of which API to use to work with POS devices. So far I found OPOS which is implemented as a set of COM objects, a .Net library which seems to be based on the COM objects and an upcomming standard called UnifiedPOS.</p>
  
  <p>The problem is, that the COM objects seem to be quite old and the .Net stuff has not been updated since .Net 1.1. But I was not able to find an implementation of the UnifiedPOS specification.</p>
  
  <p>Does somebody know something like a UnifiedPOS SDK for windows? Or could somebody recommend the usage of OPOS or any other API?</p>