Remapping Keys

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Contents

Windows XP

Description

In [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Keyboard Layout], add a binary key Scancode Map with the following format: 

 Start offset (in bytes) Size (in bytes) Data
 0                       4               Header: Version Information (always 0)
 4                       4               Header: Flags               (always 0)
 8                       4               Header: Number of Mappings
12                       4               Mapping #1
...
Last 4 bytes             4               Null Terminator (0x00000000)

Note that the bytes of each word are ordered least-to-most significant!

Example: Mapping Caps Lock to Escape 

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Keyboard Layout]
"Scancode Map"=hex:00,00,00,00, 00,00,00,00, 02,00,00,00, 01,00,3a,00, 00,00,00,00

Breakdown of data: 

00,00,00,00, Header: Version Information
00,00,00,00, Header: Flags 
02,00,00,00, Header: Number of Mappings (2)
01,00,3a,00, Map KEY: caps lock (0x003a) to FUNCTION: Escape (0x0001)
00,00,00,00  Null Terminator

Example: Mapping Caps Lock to Control 

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Keyboard Layout]
"Scancode Map"=hex:00,00,00,00, 00,00,00,00, 02,00,00,00, 1D,00,3a,00, 00,00,00,00

Example: Mapping Caps Lock to Play/Pause 

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Keyboard Layout]
"Scancode Map"=hex:00,00,00,00, 00,00,00,00, 02,00,00,00, 22,E0,3a,00, 00,00,00,00

References

Mac OS X

Easy: just go to 'System Preferences:Keyboard & Mouse:Modifier Keys...'

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