I am in begging mode and need some advice on computers.

At present I have two PC laptops(both Win 2000) both PII - one is British and the other Japanese. I use Hotmail for email - but for MS word, if any document is gonna be English only I use by Brit pc a mix of Jp and English I use by J-PC. Silly system really - the Brit PC has the free download from microsoft so as to be able top read J- web documents - my problem is on the subject of input. I know there is software out there whereby I can input both languages on to the same Word document(for example) at the same time on an English operating systenm PC. What software do people use?
What about for new Apple Macs?