There are many ways to enter special characters. Some of the ways listed below use tools built into Windows, while some require additional programs.

Using Only Tools Included in Windows and Citavi
  1. Using the Clipboard
    If you already have the words spelled in another document, the easiest way is to copy and paste them to Citavi.
     
  2. Using the Windows Character Map
    This is also reliable, but not as easy. To open the Character Map from within Citavi, right-click a field, point to Special characters, and click Windows Character Map. Select a Unicode font (such as Arial Unicode MS or Segoe UI) and then scroll through the list of characters to find the one you need. Click a character to magnify it (#1 in the image), and look at the ToolTip that appears when you hover over a character — it tells you what it is. When you've found the right character, click it, then click Select (#2) and then click Copy (#3). Now you can paste it into Citavi (or any other program.)
     
  3. Using Another Keyboard Layout
    If you frequently type in one other language, you may find it easiest to learn to use the keyboard layout for that language. To enable additional keyboard layouts, on the Start menu, in the Control Panel, open Regional and Language Options. Click the Keyboards and Languages tab, then click Change keyboards. Click Add, find the language and culture you need, and select the checkbox for the keyboard layout you want to add. Note that in Windows, keyboard layouts are selected on a per-application basis, so you may need to make sure that the desired layout is selected in Citavi, in Word, etc.
     
  4. Using Windows Keystrokes
    Windows supports entering characters into any program using their classic Windows character codes. The Character Map shows you the Windows character code for the selected character (see #4 in the screenshot above). To enter it, hold the Alt key and type the three- or four-digit code using the numeric keypad. (You cannot enter these keystrokes using the number keys above the alphabet keys.)
     
  5. Using Unicode Codes in Citavi
    Citavi supports entering characters using the Unicode codes ("code points") that identify each character. You must know the code for the character, so this method is good for a small number of characters you enter frequently. The Character Map shows you the Unicode code point for the selected character (see #5 in the screenshot above). Type it in Citavi, and then immediately press Ctrl+Alt+U.

Using Other Programs
  1. PopChar is an inexpensive program that gives you a pop-up palette of characters.
  2. WizKey is an inexpensive program that gives you easy shortcuts to accented characters.
  3. Microsoft Keyboard Layout Creator is a free program to create your own keyboard layouts.
For more information about Unicode text entry, see the Wikipedia article Unicode input.