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 ### Detailed designs and notes
 Here are some breakdowns of design notes that went into the design of individual nodes.
 * [[Email]]
+
+### Testing changes to nodes
+
+On a Windows system, the default location for Node-RED supplied nodes is:
+
+```
+C:\Users\<userid>\AppData\Roaming\npm\node_modules\node-red\node_modules
+```
+
+This becomes useful during testing.  Within this directory, you will find the current implementations of the nodes.  If you are making changes to the source of this project's nodes you can replace the ones found there with your own copies.