switch languages

[info]

I need to switch languages (English, French, Italian) very often within the same document. Is there some way to switch keyboard layouts on FreeBSD quickly and painlessly as can be done on Windows?
On Windows, hiting Left Shift + Alt switches between keyboards.
An alternate way of entering accented or "strange" characters (on Windows) is to hold down Alt and enter the ASCII codes from the number pad, e.g. Alt - 0233 produces �.
What options are there in FBSD - Unix?
Thanks for any help.
PJ



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