There are some special functions in FitNesse that require you to name a directory path. You do this with the !path directive.

Markup Text	Displays as
!path c:\directory	classpath: c:\directory

You can also specify all the .jar files in a directory by using a wildcard:
!path /usr/javalib/*

Paths such as these will be used when you press the test or suite buttons on a page.