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Technically, any COM component that implements IInputMethod can be selected into the software-based input panel. The IsSIPInputMethod subkey is a shortcut that presents a list of IMs to the user without loading and querying each object for IInputMethod.
IMs are installed in the system as in-process COM servers by using standard COM registry keys. The HKEY_CLASSES_ROOT\CLSID key contains subkeys that represent COM components. The subkeys are textual representations of class identifiers (CLSID). The CLSID subkeys contain an InprocServer32 subkey with a default value. This value specifies the DLL path that implements the component. The CLSID subkeys also contain an IsSIPInputMethod subkey that has a default value that is equal to the 1 string. The following table shows examples of IM registry values.
| Key | Default value |
|---|---|
| HKEY_CURRENT_USER\CLSID\ {4a4a96d7-ae04-11d0-a4f8-00aa00a749b9} |
MS QWERTY IM |
| HKEY_CURRENT_USER\CLSID\ {4a4a96d7-ae04-11d0-a4f8-00aa00a749b9}\ InprocServer32 |
\Windows\alphanum.dll |
| HKEY_CURRENT_USER\CLSID\ {4a4a96d7-ae04-11d0-a4f8-00aa00a749b9}\ IsSIPInputMethod |
1 |
See Also
Software-Based Input Panel Registry Settings
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