Abstract: An autonomous vehicle having sensors advantageously varied in capabilities, advantageously positioned, and advantageously impervious to environmental conditions. A system executing on the autonomous vehicle that can receive a map including, for example, substantially discontinuous surface features along with data from the sensors, create an occupancy grid based upon the map and the data, and change the configuration of the autonomous vehicle based upon the type of surface on which the autonomous vehicle navigates. The device can safely navigate surfaces and surface features, including traversing discontinuous surfaces and other obstacles.

Abstract: A handheld client computing system selectively retrieves items, such as email messages, from a server through either a POP transport or an IMAP transport and selectively maintains the items on the client. The retrieval and maintenance is based on predetermined criteria, such as predetermined date, size or keyword information. Initially, the H/PC (handheld personal computer) downloads item identification information from the server on the client/server network and determines which items are not present on the H/PC. Those items located on the server and not on the H/PC are selected for possible downloading to the H/PC. However, before each item is downloaded to the H/PC in its entirety, the H/PC downloads only the header of the selected item. The header information is analyzed to determine whether to download the entire item based on predetermined criteria, such as date information.

Abstract: A handheld client computing system selectively retrieves items, such as email messages, from a server through either a POP transport or an IMAP transport and selectively maintains the items on the client. The retrieval and maintenance is based on predetermined criteria, such as predetermined date, size or keyword information. Initially, the H/PC (handheld personal computer) downloads item identification information from the server on the client/server network and determines which items are not present on the H/PC. Those items located on the server and not on the H/PC are selected for possible downloading to the H/PC. However, before each item is downloaded to the H/PC in its entirety, the H/PC downloads only the header of the selected item. The header information is analyzed to determine whether to download the entire item based on predetermined criteria, such as date information.

Abstract: A handheld client computing system selectively retrieves items, such as email messages, from a server through either a POP transport or an IMAP transport and selectively maintains the items on the client. The retrieval and maintenance is based on predetermined criteria, such as predetermined date, size or keyword information. Initially, the H/PC (handheld personal computer) downloads item identification information from the server on the client/server network and determines which items are not present on the H/PC. Those items located on the server and not on the H/PC are selected for possible downloading to the H/PC. However, before each item is downloaded to the H/PC in its entirety, the H/PC downloads only the header of the selected item. The header information is analyzed to determine whether to download the entire item based on predetermined criteria, such as date information.

Abstract: A clean-up system recaptures part of the memory or secondary storage space on a client device, such as a handheld personal computer. E-mail messages are organized in a hierarchy of folders within a database. Each folder may or may not contain e-mail messages. A user downloads e-mail messages from a server to the client device. The user marks any folders that he wishes to use upon disconnect from the server for off-line use. Upon disconnect from the server, the clean-up system begins with the first e-mail message in the database. A test module determines if the e-mail message is linked to a folder in the service hierarchy to be cleaned-up. If the message is linked to a folder in the service hierarchy to be cleaned-up, an off-line module determines if the folder is marked for off-line use. If the folder is marked for off-line use, the message linked to the folder is retained for later use.