An extension point is a named marker that references a location or set of locations within the behavioral sequence for a use case, at which additional behavior can be added.

a location at which the use case can be extended with additional behavior

a location within a use case at which action sequences from other use cases may be inserted

A base-station 2-radio transceiver that bridges the gap between a wireless client and an access point or between a wireless client and another extension point.

a join point in AOP

In Network Registrar, element of a script written in TCP, C, or C++ that customizes handling DHCP packets as the server processes them, and which supports additional levels of customizing DHCP clients.