Answer
Yes. These documents can be served and the layout accessed using the GET_LAYOUT request in a custom ArcIMS client.
For ArcIMS version 4.0 and 4.0.1:
When requesting a layout using GET_LAYOUT neither tables nor charts will be visible in the resulting image.
For ArcIMS version 9.0:
When requesting a layout using GET_LAYOUT tables will not be visible in the resulting image. Charts will be visible.