If you are traveling internationally ... depending on the countries involved ... there is a very small chance that you might get harrassed for taxes (maybe around 30% to 50% of the new value of the computer) on the second laptop. If you want to be careful call the consulate for the country and ask (preferably multiple different locations and compare the answers). A lot of travel guides and websites have wrong or out of date customs information so don't rely on third party info.