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When you double-click a .ned file in the IDE, it will open in the NED editor.
The new NED editor is a dual-mode editor. In the editor's graphical mode, you can edit the network using the
mouse. The textual mode allows you to work directly on the NED source.
When the IDE detects errors in a NED file, the problem will be flagged with an error marker in the Project Explorer and the Problems View will be updated to show the description and location of the problem. In addition, error markers will appear in the text window or on the graphical representation of the problematic component. Opening a NED file which contains an error will open the file in text mode. Switching to graphical mode is possible only if the NED file is syntactically correct.