Sony Trinitron TV with PIP

Question

A co-worker gave me a Sony Trintron TV with PIP. The TV is from 1992 and works great. If available with this model, how can I find close captioning?
Also, the TV has PIP. How do I change the channel on the within smaller TV screen. If I turn on PIP, both pictures are the same channel.
Thanks for your anticipated cooperation.
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