Apparatus for testing a random number generator includes a random number generating unit that generates and outputs random numbers, and a switching unit that receives the random numbers from the random number generating unit and selectively transmits the random numbers in response to a switching control signal. The spindle protrudes through a bushing and forms an annular chamber therebetween that is connectable to a vacuum source through 360\xb0 of rotation. In one embodiment, the base gaming module may include a security monitoring system operable to determine a security configuration including error conditions that depends on features of gaming modules coupled to the base gaming module. Various types of bacterial capsular polysaccharide antigens were chemically conjugated with the LTS61K protein by a reductive amination reaction. For example, the progress indicator may unobtrusively indicate an amount of time left in the present turn in a clear, distinctive manner.