The program by setting the parallel port can be input-output model, to monitor parallel port to control the state of the IO.

port_WR
.......\AssemblyInfo.vb
.......\bin
.......\...\Interop.MSComCtl2.dll
.......\...\WinIo.dll
.......\...\WinIo.sys
.......\...\WINIO.VXD
.......\...\工程1.exe
.......\...\工程1.pdb
.......\...\工程1.vshost.exe
.......\...\工程1.xml
.......\My Project
.......\obj
.......\...\Debug
.......\...\port_WR.vbproj.FileList.txt
.......\...\port_WR.vbproj.FileListAbsolute.txt
.......\port_WR.Designer.vb
.......\port_WR.resx
.......\port_WR.sln
.......\port_WR.vb
.......\port_WR.vbproj
.......\port_WR.vbproj.user
.......\winio.bas
.......\winio.vb
.......\_UpgradeReport.htm
.......\_UpgradeReport_Files
.......\....................\UpgradeReport.css
.......\....................\UpgradeReport_Minus.gif
.......\....................\UpgradeReport_Plus.gif

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