Likely a taste of things to come, stock and currency markets were knocked back and forth on the first day of Donald Trump's new presidency as they second guessed his trade tariff plans and remained largely in the dark on the issue as U.S. markets return from Monday's holiday. Trump's inauguration was accompanied by dozens of executive orders and directives - ranging from emergency immigration curbs on the Mexican border to more oil drilling, a demand that government agencies control inflation, U.S. withdrawal from climate accords and pardons for 2021's Capitol Hill rioters. But there were no specific Day One measures on long-promised trade tariffs - something flagged early on Monday by a Wall Street Journal report that weakened the U.S. dollar sharply and lifted overseas stock markets seen to be in the firing line.