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Can I use multiple accounts on one device/ computer?

I'm an American in Japan. I use the American iTunes/App store, but I also want to purchase things in the Japanese store for apps for my MacBook Pro. Can I use both stores? I have a gift card for the JP store, but no account yet. Will both be accepted on my Mac?

I have dollars to my credit in the American store and a 10,000 yen gift card to the Japanese store.