Be sure to visit the Trace Modeler website for updates and UML sequence diagram resources!
Existing diagrams can be opened in a couple of different ways.
To open an existing diagram
The 'Open diagram' window is where you can select the diagram file (.trace) you wish to open.

You can also open a diagram by picking it from a list of recently used diagrams :
Note that each recently used diagram can be opened with a keyboard shortcut (CTRL-0 through CTRL-9).
To open a diagram in a remote location,
The 'Open from URL' dialog is where you can type the URL to the remote location of the diagram file you wish to open.
