Hey Guys,  I hope this is helpful:

As Patty pointed out, Röding,  Roding or Roeding are all valid ways of
expressing the same author, as will be the same sort of thing with several
other author’s name derivations.

If you are a user of Microsoft Windows and don’t want to have to memorize or
keep around the ASCII tables, the easiest way to have the special characters
available is to (in Windows) set you keyboard from English US to the
International Layout.  You can set it up for dual layout, where you an click on
an Icon on the Windows Bar to toggle between a standard and International
Layout by have both the International and the US settings installed.

Then you have quick shortcut keys to all the characters.   This is accomplished
by typing character which approximates the accent then the letter.  Example:
to get ñ press (shift) ~ then n,  ñ  will appear on the screen.
As such if you just wanted a tilde ~ you press the ~ then the space bar

Here is a list of the sequences I know of:
Most of these work for Upper & Lower Case
‘ a   =  á
“ a   =  ä
^ a   =  â
‘ e   =  é
“ e   =  ë
` e   =  è
` i   =  ì
‘ i   =  í
“ i   =  ï
^ i   =  î
“ o   =  ö
` o   =  ò
‘ o   =  ó
^ o   =  ô
“ u   =  ü
` u   =  ù
‘ u   =  ú
‘ c   =  ç
~ n   =  ñ

Unfortunately for the Euro symbol there is only the ASCII Code
Alt+0128 =  €
Alt+255
Note: Alt+128 = Ç

Although  Alt+255 is supposed to be the code,
ß   An alternate for this German (Deutsch) character still eludes me.

Here are a few links to ASCII Information:
For the Full ASCII Table got to:
http://www.asciitable.com/   or   http://www.ascii.cl/

For the: ISO Latin 1 Character Entities and HTML Escape Sequence Table
http://www.bbsinc.com/symbol.html

For a lot of information on ASCII
http://www.neurophys.wisc.edu/www/comp/docs/ascii.html

(From Patty)
Alt+129 = ü
Alt+130 = é
Alt+135 = ç
Alt+136 = ë
Alt+147 = ô
Alt+148 = ö
Alt+149 = ò
Alt+160 = á
Alt+162 = ó

Leslie