Once you have compiled NumPanel and downloaded it to your Palm size PC, you still need to modify the registry on the Palm size PC to register the input method.  To do this, use the remote registry editor tool to make the following modifications:

[HKEY_CLASSES_ROOT\CLSID\{C915FE81-24C0-11d2-93F7-204C4F4F5020}]
@="Numeric Keypad"

[HKEY_CLASSES_ROOT\CLSID\{C915FE81-24C0-11d2-93F7-204C4F4F5020}\InprocServer32]
@="\windows\\NumPanel.dll"

[HKEY_CLASSES_ROOT\CLSID\{C915FE81-24C0-11d2-93F7-204C4F4F5020}\IsSIPInputMethod]
@="1"

[HKEY_CLASSES_ROOT\CLSID\{C915FE81-24C0-11d2-93F7-204C4F4F5020}\DefaultIcon]
@="\windows\\NumPanel.dll,0"