Login Sequence Diagram

 Diagramatic representation of the  interaction between processes in their own order is
a Sequence Diagram.
A simple Sequence diagram for login is shown below:

Short descriptions on notations used in the above diagram.

  An actor is an entity that interacts with the system
(can be human or any other process or entity that interacts with the system  ).

Call Message :
 Represents the forward communication between the entities .

Return Message :
Represents the message passed back to the caller.

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