An image forming apparatus comprises a document reading unit for reading a document on a table or at a predetermined reading position to which the document is transported by a document feeder and an interrupt key for receiving an interrupt job. The test monitor includes a method for executing instruction sequences simultaneously in several processors of a multiprocessor machine. Each side portion defines a retaining space with an elongated protrusion, two channels, and an end portion. The absorber defines a plurality of openings each having a maximum width that is less than or equal to the distance. The antenna range extender is positioned between and proximate to one of the RF antenna and the electronic device, for extending the operating range over which information may be communicated and exchanged between the RF antenna and the electronic device.