Abstract: A method of debugging a multiple concurrent processes comprising: obtaining, from each process, a plurality of events that have been processed and, if no time information is associated with each event, associating time information therewith; causing a display to display the events such that an event that has occurred in a first portion of the display associated with a first process at a first time is aligned with an event in a second portion of the display associated with a second process that has occurred at a similar time to the first time. To be accompanied, when published, by FIG. 5 of the drawings.

Abstract: A method of debugging a multiple concurrent processes comprising: obtaining, from each process, a plurality of events that have been processed and, if no time information is associated with each event, associating time information therewith; causing a display to display the events such that an event that has occurred in a first portion of the display associated with a first process at a first time is aligned with an event in a second portion of the display associated with a second process that has occurred at a similar time to the first time. To be accompanied, when published, by FIG. 5 of the drawings.

Abstract: A cleaner head for a cleaning appliance includes a housing, a suction opening through which dirt-bearing air enters the cleaner head, and a plurality of floor engaging support members connected to the housing. Each support member includes a curved lower surface and a rolling element located within a recessed portion of the lower surface of the support member. The outer surface of the rolling element is substantially coincident with a locus, or virtual surface, described by the lower surface of the support member.

Abstract: A cleaner head for a cleaning appliance including a housing having an air outlet, a rotary brush bar assembly located within a chamber of the housing, the chamber having an air outlet which is in fluid communication with the air outlet of the housing, and a drive mechanism for driving the brush bar assembly, the drive mechanism extending into the chamber between first and second side walls of the chamber, wherein the brush bar assembly comprises a first brush bar section located within a first section of the chamber between the drive mechanism and the first side wall of the chamber, and a second brush bar section located within a second section of the chamber between the drive mechanism and the second side wall of the chamber, and wherein the air outlet of the chamber extends between and into both sections of the chamber.

Abstract: A cleaner head for a cleaning appliance includes a housing, a sole plate for engaging with the floor surface, the sole plate comprising a suction opening through which dirt-bearing air enters the cleaner head, and a flexible annular seal located between the sole plate and the housing to allow the housing to move relative to the sole plate to reduce the force exerted on the sole plate by the housing, thereby allowing the sole plate to ride over the floor surface during a cleaning operation. The cleaner head includes at least one floor engaging support member connected to the housing for restricting the movement of the housing towards the sole plate to prevent the housing from pushing the sole plate against the floor surface.

Abstract: A cleaner head for a cleaning appliance includes a housing, a moveable agitator located within the housing, and a detachable unit extending about the agitator. The detachable unit includes a sole plate having a suction opening through which dirt-bearing air enters the cleaner head, a chassis detachably connected to the housing, and a flexible annular seal for allowing relative movement between the housing and the sole plate. One end of the flexible annular seal is connected to the chassis and the other end of the flexible annular seal is connected to the sole plate.