Hi, Please any one can help me regarding this problem. My problem is , I am trying to compile some code using VC++ 6.0 originary written in linux. In which it is using some of the hp OVO api's like opc_connect(), opcmsg_get(),etc .I get the prototype of these functions in opcsvapi.h file and code is compiling but it is giving linking error "unresolved external symbol _opc_connect". Is any one can tell me the dll required to solve this problem and where I will get it. Thank you, -- Posted via http://www.ruby-forum.com/.