You can expand the Ant project node to see targets defined by it.
Targets marked with the special icon
have an associated description and are intended to be more visible
to the user (for example, ant -projecthelp on the
command line will show them first).
Each target can be further expanded to reveal individual tasks.
You can edit the project as XML by right-clicking it and selecting Open. Or, you can make many edits directly in the Explorer.
If there is an XML parse error in the file, you will see an error icon
and the Explorer tooltip will indicate the problem.
Also sometimes a certain element is not allowed in a particular place by Ant,
and again an error icon
and tooltip will alert you.
Note that Ant scripts not stored in a directory (e.g. in a JAR or FTP filesystem) can be viewed, and edited if the filesystem supports it, but never executed. This is a restriction of Ant itself (it does not understand the IDE's special filesystems).