The Graph Editor is usually invoked by CBIva (the CB workbench)
by using the menu item Browse 
Graph Editor.
If CBIva is connected with a CB server, the Graph Editor will be connected to this server and you will be prompted to enter the object name you want to start with and a name of a graphical palette. The graphical palette is a Telos object which represents a set of graphical types which will be used to visualize Telos objects (see Appendix C). On startup, the Graph Editor retrieves all information about the graphical types from the server. Depending on your system, this might take about 10 seconds.
If CBIva has no connection with a server, the Graph Editor will be started without a connection and no internal window will be opened within the Graph Editor.
It is also possible to start the Graph Editor directly from the command line without starting CBIva. The main class of the Graph Editor is i5.cb.graph.cbeditor.CBEditor. This class has to be given as argument on the command line when you invoke the Java Virtual Machine, e.g.
java -classpath $CB_HOME/lib/classes/cb.jar i5.cb.graph.cbeditor.CBEditor