Abstract: A tile assembly (22) which, in use, is fitted to a base structure to form at least part of a fluid washed surface. The tile assembly comprises a housing (42) with at least one plenum (45) being provided within the housing (42). A wall (44) of the housing (42) is provided with a plurality of flow passages (46) which extend from the plenum side of the wall (44) to an outer surface (48) of the wall. Flow passage closures (50) are provided which are operable to open and close at least some of the flow passages (46).

Abstract: A tile assembly (22) which, in use, is fitted to a base structure to form at least part of a fluid washed surface. The tile assembly comprises a housing (42) with at least one plenum (45) being provided within the housing (42). A wall (44) of the housing (42) is provided with a plurality of flow passages (46) which extend from the plenum side of the wall (44) to an outer surface (48) of the wall. Flow passage closures (50) are provided which are operable to open and close at least some of the flow passages (46).

Abstract: A system and method for enabling firewalled access to a client object residing behind a firewall, via an exported callback reference, by a server object outside the firewall. The system includes callback registry accessible by a proxy operating in conjunction with the firewall. The callback registry proxifies the callback object reference so that a callback will be directed to the proxy which in turn will redirect the callback to the callback object. Callback registry, additionally, stores callback definitions, callback registration and access control policies associated with registered callback objects. These access policies are applied to the callback for the server object to ensure that only authorized objects make the callback on authorized callback objects and their operations.