In Windows XP service Pack 2 there is a program called Private Character Editor (it's built in). You'll have to use character Map to insert your new characters, but once inserted can always use copy/paste from there. I created the c with a line over it.
To run Private Character Editor (PCE), click on start, run, then type eudcedit. This will bring up the editor. A "select code" window will appear with a blank box selected. Click ok. A box with gridlines will open.
To create the c with the line over it, click on Edit, then on Copy Character. If you are like me, I use Arial quite a bit. So on the font button, click on it and select Arial and Regular, then Ok. This brings up the Arial Character set. Click on the lowercase c and then on ok. You'll have a c on your grid box. Now click on the pencil icon in the upper left corner. I recommend starting 4 squares above the c and creating a line 4 squares high extending to the right and left widths of the existing c. Click on File and then on Font Links; I recommend linking with all fonts. Click ok.
Now click on save character. Bring up Character map and select All fonts Private Characters. Click on your new c and copy/paste into your document. Just be sure to save those characters to another empty block (which will assign new codes to your new characters and avoid overwriting your new one).
Sounds like it would make that special letter available in ALL your fonts, via CharMap -- such as a signature letter... TD

