OPC client development a must-see, it is contains more than one source, synchronous, asynchronous communications are.

Documents
.........\opcda205_cust.doc
.........\opcda20_auto.doc
Samples
.......\Bin
.......\...\OPCBar.ocx
.......\...\opccomn_ps.dll
.......\...\OPCDAAuto.dll
.......\...\OPCJDADemoServer.exe
.......\...\OPCPROXY.DLL
.......\...\OpcServer.exe
.......\...\OPCTrend.ocx
.......\...\RegOPC.bat
.......\Chap2
.......\.....\Async
.......\.....\.....\Form1.frm
.......\.....\.....\Project1.vbp
.......\.....\Sync
.......\.....\....\Form1.frm
.......\.....\....\Project1.vbp
.......\Chap3
.......\.....\dlgAbout.frm
.......\.....\dlgAbout.frx
.......\.....\OPCGeneral.pag
.......\.....\OPCTrend.vbg
.......\.....\OPCTrend.vbp
.......\.....\OPCTrend_TGGeneral.pag
.......\.....\TestTrendGraph.vbp
.......\.....\TestTrendGraph_Form1.frm

.......\.....\TrendGraph.ctl
.......\.....\TrendGraph.ctx
.......\Chap4
.......\.....\ActiveX.xls
.......\.....\BarMeter
.......\.....\........\BarMeter.ctl
.......\.....\........\BarMeter.ctx
.......\.....\........\dlgAbout.frm
.......\.....\........\dlgAbout.frx
.......\.....\........\OPCBar.vbg
.......\.....\........\OPCBar.vbp
.......\.....\........\OPCBar_BMGeneral.pag
.......\.....\........\OPCBar_BMGeneral.pgx
.......\.....\........\OPCGeneral.pag
.......\.....\........\TestBarMeter.vbp
.......\.....\........\TestBarMeter_Form1.frm

.......\.....\Demo.xls
.......\.....\VBA.xls
.......\Readme.txt

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