TurboTax Online does not require access from a specific computer. Therefore you can access your TurboTax online account from different computers. There isn't any limit. The limit is restricted to the CD/Download TurboTax.
If you want to use the CD/Download TurboTax product, you can see the different products here and decide which one suits your situation: http://turbotax.intuit.ca/personal-tax-software/download-tax-software.jsp
If you want to use the TurboTax Online product, see link: http://turbotax.intuit.ca/personal-tax-software/online-tax-software-201502.jsp?s_tnt=71799:5:0
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