This panel connects to the KNIME public server, which is a KNIME Server with restricted access. To connect to the KNIME public server just click the "Connect" button (of course you need to have Internet connection).
To download a workflow, just right-click the workflow and select "Download Workflow". Thus the selected workflow will appear in the list of workflow projects in the current workspace. The workflow has been downloaded from the server comprehensive of its input data.
"002_DataMining" contains examples on how to train and apply data mining models, be it a decision tree or a neural network. "050_Applications" contains example solutions for the most common problems in data mining, like how to implement a recommandation engine or how to perform a credit scoring on your data.