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Cell address is combination of column name (alphabets from A-Z) and row number such as A10 where A refers to the column name and 10 identifies the row number. A cell  address identifies the location of row and column in Excel.

Mouse is the only device that points, inputs as well as helps drawing in a Graphical User Interface (GUI). The pointer (generally an arrow) positions the focuses on to the pointing object. With help of its buttons, one can drag the coordinates of the shape to be drawn.

To give instructions to a computer, the set of rules for computer operations can be stored in the form of programs using an artificial language called programming language

Documentation is needed to supplement human memory and to help organize program planning. Typical program documentation meterials include the origin and nature of the problem, a brief narrative description of the program, logic tool such as flowcharts and pseudocode, data record descriptions, program listing, and testing results.

In client-server architecture, the client requests a  connection to the server by sending SYN (synchronize) message. Responding these requests, server sends the acknowledgement (SYN-ACK) to the client. SYN flood is a kind of denial-of-service attack in which an attacker sends a succession of SYN requests to consume enough server resources to make the system unresponsive to legitimate traffic.