Instances of tools may be accessible from the Tools menu. That is, when certain tools or extensions have been started and not quit during a Chimera session, a menu item of the form
Tools... Tool_nameor (depending on the tool or extension)
Tools... Tool_name - dataexists, where Tool_name is the tool's full or abbreviated name and data is the name of the data being shown or manipulated by the tool. There can be multiple instances of the same tool with the same data file or different data files. A submenu for each instance contains the options: