Creating a system border

A system border represents the environment. Events or operations that do not come from instance lines shown in the chart are drawn coming from the system border.

About this task

A system border is a column of diagonal lines, labeled ENV. You can place a system border anywhere an instance line can be placed, but the typical locations are the far left and right edges of the chart.

Sequence diagram showing system border (ENV)

To create system borders:

Procedure

  1. Click the System border button System border button.
  2. Move the cursor into the drawing area, then click to place the system border. The system border is now anchored in place.
  3. Because the system border represents the environment, it is named ENV by default. If wanted, rename the system border.

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