this example will teach you how windows filter input keyboard events. The example put into Cap Ctrl keys.

Packet : 37724110ctrl2capsource.zip filelist
INSTALL/ctrl2cap.c
INSTALL/ctrl2cap.dep
INSTALL/ctrl2cap.dsp
INSTALL/ctrl2cap.dsw
INSTALL/ctrl2cap.ncb
INSTALL/ctrl2cap.opt
INSTALL/ctrl2cap.plg
INSTALL/Debug/
INSTALL/Release/
README.TXT
RELEASE/ctrl2cap.amd.sys
RELEASE/ctrl2cap.exe
RELEASE/ctrl2cap.nt4.sys
RELEASE/ctrl2cap.nt5.sys
RELEASE/README.TXT
SYS/build.err
SYS/build.wrn
SYS/build64.bat
SYS/buildfre_wnet_AMD64.err
SYS/buildnt4.bat
SYS/buildnt5.bat
SYS/ctrl2cap.c
SYS/CTRL2CAP.H
SYS/ctrl2cap.rc
SYS/MAKEFILE
SYS/NTDDKBD.H
SYS/objfre/
SYS/objfre/i386/
SYS/objfre/i386/ctrl2cap.sys
SYS/objfre_wnet_amd64/
SYS/objfre_wnet_amd64/amd64/
SYS/objfre_wnet_amd64/_objects.mac
SYS/source.nt4
SYS/SOURCES
SYS/sources.nt4
SYS/sources.nt5
SYS/symbols.nt5/
SYS/symbols.nt5/sys/

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