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Diagram elements fall into four major categories: propagators, anchors, shapes, and free text. While the user cannot create an anchor from the palette, the rest of these can be added to the diagram by dragging and dropping the corresponding item from the menu on the right. The user can also quickly build diagrams using the shortcuts described in section \ref{sect:shortcuts}.  Individual elements can be selected by clicking on them or encompassing them with a selection rectangle created by dragging on the canvas. If multiple items are encompassed by the rectangle then only configuration parameters that would normally apply to multiple items of that each selected  type in a given diagram are shown. \subsubsection{Shortcuts}\label{sect:shortcuts}  The shortcuts implemented in the web application are an attempt to provide the optimal workflow for constructing diagrams. As of revision number 450, the implemented shortcut scheme is as follows:  \begin{itemize}  \item Create an Anchor: alt + click  \item  \end{itemize}  \subsubsection{Element Configuration}\label{sect:configuration}