Fitnesse - Fixture in Fit
The first row of a FIT table is normally used to initialise the fixture class. In addition to that, you can pass arguments to the fixture by appending cells after the class name in that row. Fixture arguments work very similar to command-line arguments of a main method and they can be accessed using the args array in the fixture.
Example from the doc
!|ArgumentsTest|Hello World|Houston We Have a Problem|