Look for the keyboard icon on the right-hand side of your taskbar, bring up the on-screen keyboard, and hold down (or left-click and hold) your cursor over the letter you’d like to accent.

To type special characters in Windows, hold the Alt key, type the number code associated with the special character you want using the numpad that's located on the right side of your keyboard.

You can add any number of custom keyboard shortcuts, which will make your iPhone automatically insert phrases or symbols when you type a certain phrase.