You can export a static image at any time during a simulation by using one of the standard JetStream Roamer image exports, whilst the simulation tab is active. See the section called "Exporting an image" in the chapter called "File Management" in the JetStream Roamer book for more information.
You also have the option to Export an AVI of an entire TimeLiner simulation.
You can export a TimeLiner simulation as an AVI or as a sequence of still images, using the File, Export, Animation dialog. See the section called "Exporting an animation" in the chapter called "File Management" in the JetStream Roamer book for more information.