Virtual multilingual keyboard

[H.S.Rai]

How I can enter UNICODE text in Indian language (Hindi Punjabi)? I
could see some parts of GUI and application in Punjabi. I have "Lohit
Punjabi" font installed and listed in OpenOffice as well as AbiWord.
On typing with Lohit Punjabi font, I still get ENGLISH typed, and not
punjabi. I cannot use special keyboard. I want to use normal keyboard
of laptop, or virtual keyboard. Is there any such keyboard? I tried
gok, but there appear no button to switch language / change keyboard.

Please help.

-- 
H.S.Rai