Here you can find useful documents and whitepapers regarding OPC Classic OPC UA and communication technology in general.
OPC Unified Architecture - Technical Overview (by Uwe Steinkrauss)
OPC Unified Architecture - Selection Criteria for SDK/Toolkit (by Uwe Steinkrauss)
DCOM Help V2.0 (by Uwe Steinkrauss)
If the content of the CHM file is not displayed, please refer to Microsoft Knowledge Base Article 896358 (right click and unblock the CHM file).
DCOM Checklist V1.0 (by Uwe Steinkrauss)
for advanced users only
Step-by-Step description to connect WebDav Share
for file exchange