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COMPARISON of .NET or ACTIVE X controls vs. OPC
 
.NET or ACTIVE X:
• This concept was introduced in 1991 and the ActiveX name was coined in early 1996.
• In-Process server integrated into one single application.
• Extremely light weight.
• A very solid foundation to begin with.
• Almost every Microsoft product supports it.
• Thousands of companies support it world-wide.
• Extremely fast and low resource consumer.
• Typically run-time licenses are free.
• Several options available to build client-server or n-tier applications.
• Only one application needed.
• Natively based on COM & DCOM
 
Additional issues for .NET
• Introduced early 2003.
• Native Support for COM & DCOM withdrawn. Use layers to support COM & DCOM.
• Basis for all long-term software technology infrastructure.
 
OPC:
• Introduced in 1997.
• Extremely heavy, needs a very souped up machine.
• The specification has been a moving target.
• No Microsoft product has native support for OPC except VC++. You must use automation layer as an interface.
• Very few companies support OPC.
• Slow and heavy on resources.
• Based on COM & DCOM.
• Setup is very complicated unless using on the same machine & from the same vendor.
• Must pay for each node.
• Must run multiple applications.
 
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