Tildes: Hold down the Option key, and then press the "n" key. Release the
keys and then press the letter you want underneath the tilde.
´ Accent Marks: Hold down the Option key, and then press the "e" key.
Release the keys and then press the letter you want underneath the accent
mark.
(This should work in all Mac applications.)
There is a program you can use to find out what symbols are mapped to the
keys on your keyboard. If you press the Option key with it open, the
letters on the onscreen keyboard will be replaced with symbols. Add the
Shift key and even more symbols will appear. You can write down the
keystrokes for your favorite symbols for future reference (starting with
Option or Option-Shift)
OS X versions prior to 10.3 include an application called Key Caps that
allows you to explore your keyboard layout. You can launch it from the
Apple menu in OS 9, or /Applications/Utilities/Key Caps in OS X.
OS X 10.3 includes a new and improved application called Keyboard Viewer
that replaces Key Caps. Learn more about it here:
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