Question: See some examples on sequence diagrams: The objects are placed based on sequential order in a sequence diagram. The vertical dashed lines are the lifeline

See some examples on sequence diagrams:

The objects are placed based on sequential order in a sequence diagram.

The vertical dashed lines are the "lifeline" that shows the existence of the objects or actors over time; moving down the lifeline means more time is passing.

"Request PIN" is a message, and it is not a reply message; because "Request PIN" is not replying to an earlier message and is requesting information rather than responding

An alternative Frame symbolizes a choice between two or more message sequences.

"PIN entered" is a response to the "Request PIN", so "PIN entered" is a reply message

(

dashed line

) .

"Activation Box" shows when and how long an object is active

(

performing a process

)

or idle.

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