# Ratel ## Main Window

If you are using an Okapi Tool after the M9 release, you should be using the wiki online help:
http://www.opentag.com/okapi/wiki/index.php?title=Ratel

The main window is divided in two parts:

- The upper part list all the rules for the group currently selected.
- The lower part is the example area where you can try out the rules and see how they behave on a give text.

Language rules currently displayed -- Select the language group you want to work with. All the rules for the selected language group are display in the list below.

Groups and Options -- Click this button to open the Groups and Options dialog box where you can specify language groups and how they are mapped to languages.

Add -- Click this button to add a new rule at the end of the current group. This opens the Edit Rule dialog.

Edit -- Click this button to edit the rule currently selected. This opens the Edit Rule dialog.

Remove -- Click this button to remove the rule currently selected from the current group.

Move Up -- Click this button to move the rule currently selected upward in the group.

Move down -- Click this button to move the rule currently selected downward in the group.

Char Info -- Click this button to get information about the character currently selected in the Sample text edit box.