To include the content from one page into another you may use the !include widget

!include PageName

For example if you wanted to all the content from .Front Page to be displayed here you would simply type:

!include .FrontPage

As a result you will see .Front Page below:

Included page: .FrontPage (edit)

It's a Collaboration tool

Since FitNesse is a wiki web server, it has a very low entry and learning curve, which makes it an excellent tool to collaborate with, for example, business stakeholders.
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It's a Test tool

The wiki pages created in FitNesse are run as tests. The specifications can be tested against the application itself, resulting in a roundtrip between specifications and implementation.
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It's Open

FitNesse is an open source project. The code base is not owned by any company. A lot of information is shared by the FitNesse community. It's extremely adaptable and is used in areas ranging from Web/GUI tests to testing electronic components.
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-seamless causes the included page to be rendered without an enclosing box.
-c causes the included page to be collapsed.
-setup causes the included page to be used for test/suite setup.
-teardown causes the included page to be used for test/suite teardown.

Watch out for !include cycles

Don't include a page that already includes the page that you are including from. ;-)

Including Test snippets

It is often useful to include portions of test tables into your tests. You do this to bring in common setup data or common test sequences (possibly modified with variables). A convenient way to do this is to use the Backwards Search notation as follows:
!include <UtilityPage.MyUtility

This will hunt up the parent chain until UtilityPage is found, and then its child MyUtility will be included.