When domain names are registered with a domain name registrar, their installation at the domain registry of a top level domain requires the assignment of a primary name server and at least one secondary name server.

When data is replicated between database servers, so that the information remains consistent throughout the database system and users cannot tell or even know which server in the DBMS they are using, the system is said to exhibit replication transparency.

When it receives a request from a client, the DHCP server determines the network to which the DHCP client is connected, and then allocates an IP address or prefix that is appropriate for the client, and sends configuration information appropriate for that client.

When a DHCP-configured client ( a computer or any other network-aware device ) connects to a network, the DHCP client sends a broadcast query requesting necessary information to a DHCP server.

When a DHCP server receives an IP lease request from a client, it reserves an IP address for the client and extends an IP lease offer by sending a DHCPOFFER message to the client.

When the DHCP server receives the DHCPREQUEST message from the client, the configuration process enters its final phase.

When using POP, clients typically connect to the e-mail server briefly, only as long as it takes to download new messages.

When an LDAP session is created, that is, when an LDAP client connects to the server, the authentication state of the session

When users visit a website ( using " user agent " software such as a web browser ), a text string is generally sent to identify the user agent to the web server.

When a user posts to one news server, the message is stored locally.

When a private key used for certificate creation higher in the PKI server hierarchy is compromised, or accidentally disclosed, then a " man-in-the-middle attack " is possible, making any subordinate certificate wholly insecure.

: When sent from client to server, ANNOUNCE posts the description of a presentation or media object identified by the request URL to a server.

When sent from server to client, ANNOUNCE updates the session description in real-time.

When the server serves data in a commonly used manner, for example according to the HTTP or FTP protocols, users may have their choice of a number of client programs ( most modern web browsers can request and receive data using both of those protocols ).

When designing using dynamic web-based scripting technics, like classic ASP or PHP, developers must have a keen understanding of the logical, temporal, and physical separation between the client and the server.

When the receiver is ready, the server will serve, although the receiver must play to the pace of the server.

When the first server is chosen in the second or the latter games of the match, the first receiver of the game is the player who served to the first server of the game in the preceding game.

When a web server is near to or over its limits, it becomes unresponsive.

When communicating via HTTP, a server is required to respond to a request, such as a web browser's request for a web page, with a numeric response code and an optional, mandatory, or disallowed ( based upon the status code ) message.

When pressed for solutions with network connectivity, many chose the option requiring less efforts: addition of a terminal server, a device that converts serial data for transmission via LAN or WAN.

When the party is represented by members in the lower house of parliament, the party leader simultaneously serves as the leader of the parliamentary group of that full party representation ; depending on a minimum number of seats held, Westminster-based parties typically allow for leaders to form frontbench teams of senior fellow members of the parliamentary group to serve as critics of aspects of government policy.

When the chief justice dies in office or is otherwise unwilling or unable to serve, the duties of the chief justice temporarily are performed by the most senior sitting associate justice, who serves as Acting Chief Justice until a new chief justice is confirmed.

When the post of Secretary is vacant, the United States Deputy Secretary of Veterans Affairs or any other person designated by the President serves as Acting Secretary until the President nominates and the United States Senate confirms a new Secretary.

When used for cleaning, soap serves as a surfactant in conjunction with water.

When the poem is completed, the echo of the last phrase, line, or sentence, generally serves as the title.

When he sees his own unrequited love for his parents reflected during an argument in a bar, he kills a man who serves as a proxy for his father.

When she serves drinks, she asks " To whom shall this cup be given?

When Crossrail is built the rail line will drop below the surface and continue north and west under Woolwich to begin its journey under the river Thames in a way that serves the Isle of Dogs and the ExCeL exhibition centre, then the railway's tracks are likely to emerge from a tunnel beneath the River Thames at Plumstead sidings.

When the rules of the organisation do not designate a Visitor, or when a vacancy in the office arises, the Sovereign serves as Visitor, but delegates the functions to the Lord Chancellor.

Monarch Airlines serves the airport from its various UK bases as part of its programme of ski flights, as well as Christmas specials and flights in support of the When You Wish Upon A Star children's foundation.

When used pejoratively, the term serves as a device to discriminate and separate Chinese-Americans as a class different from those born in Chinese speaking countries.

When under water, the eyeball's lens serves to focus light, whereas in the in-air environment, the typically bright light serves to contract the specialized pupil, resulting in sharpness from a smaller aperture ( similar to a pinhole camera ).

When instead the name Pakal I is used, this serves to distinguish him from two later known successors to the Palenque rulership, Upakal K ' inich Janaab ' Pakal ( ruled c. 742, aka " Janaab ' Pakal II ") and Wak Kimi Janaab ' Pakal ( aka Pakal III ), the last-known Palenque ruler who acceded in 799.

When not in use by one of Denver's sports teams, the building frequently serves as a concert venue.

When the Chicago Transit Authority ( CTA ) declared their plan to close down the Blue Line – which primarily serves working-class Latino communities – Gutiérrez successfully secured $ 320 million in federal funding to reconstruct Blue Line stops and pressed the CTA to re-instate full service.

When the Big Eight folded, all of its records were moved to Kansas State's Vanier Complex and are now on exhibit in the Big Eight Room which also serves host to post game interviews after football games.

When the server serves data in a commonly used manner, for example according to the HTTP or FTP protocols, users may have their choice of a number of client programs ( most modern web browsers can request and receive data using both of those protocols ).

When an alien race's experiments in eternal universal observation cause damage to Eternity, he is narrowly saved by the actions of the Fantastic Four, Doctor Strange, Black Panther, Storm, Gravity and the Silver Surfer, Strange using Gravity as a ' scalpel ' based on his gravity-wielding powers to cut out the damaged portions while Storm serves as a temporary host to Eternity's consciousness as the other heroes hold back the universe's ' antibodies ' as they try to attack the perceived cause of the damage.

: When the first player serves, and the ball hits a high point on the wall, resulting in a fault.

When the presented material serves the supposed purpose of the author or redactor, it is suspect.

When oligosaccharides are consumed, the undigested portion serves as food for the intestinal microflora.

When a field agent is sent on a mission, Marshall serves in a function similar to Q from the James Bond films: as the in-house creator and proprietor of a number of gadgets and sophisticated tools used by field agent.