A retractable handle on a dolly for a portable compressor has a handle assembly including at least one handle pole and a handle grip member. These methods may send representations of channel locator functions to the client devices, which may use the channel locator functions to locate particular control channels, using the random keys as input. The shelf facing system is adjustable to accommodate different types or sizes of products, as well as different shelves or display units. The virtual machine runs on a host system and neither the virtual machine nor the host system are restarted in response to the receiving or storing of the archive files. The first lens is coupled to the lighting device enclosure.