InDesign CS4

PDF (adobe.com)

Typography

Formatting characters

Apply baseline shift
Make characters superscript or subscript in a non-OpenType font
Apply underline or strikethrough
Apply ligatures to letter pairs
Change the color, gradient, or stroke of text
Add transparency effects to text
Assign a language to text
Change the case of type
Scale type
Skew type

community help (adobe.com)