Terios 4wd question, Newbie, please help...

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Hi, I've just bought a 1999 Terios and after reading the manual I'm still a little confused.
Is it constant four wheel drive with the switch on the dashboard acting as a centre diff lock or is the switch used to put it into four wheel drive Unknw

Thanks for any help

This probably looks like a really daft question and for that I apologise

Kev