Designer > Implementing a BPMN Task or Event in BPEL > Understanding and Using Activity Sequences and Flows
  

Understanding and Using Activity Sequences and Flows

Each activity that you add to the Process Editor canvas is contained by a hidden sequence activity. The sequence is represented as a blue border when your mouse hovers near it, as shown.
The purpose of hidden sequences is to make it easier for you to link activities together. Activities are automatically linked in sequence when you place one activity near the top, bottom, left, or right of another activity.