Panasonic GTWIN Reference Manual page 163

Menus
The heading "Language1" is replaced by "Simplified Chinese"
5. Change the keyboard layout in the Windows task bar
If you have enabled simplified Chinese as an input language in the "Regional
Options" dialog box of the control panel, you can simply switch to a different
keyboard now. In some cases you have to choose another "Input Mode", too.
6. Click the first cell to start entering text
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GTWIN Reference Manual