When you run a web service workflow, the Integration Service can run more than one instance of a workflow to improve performance. When you configure a workflow to run as a web service, you configure the number of workflow instances to run on a hub and when to start a new workflow instance.
When you enable a workflow as a web service, the Workflow Designer enables the workflow to run concurrently with the same workflow name. The Web Services Hub determines when to start a new instance of a web service workflow based on the Maximum Run Count Per Hub and the Service Time property you configure for the web service.
When the Web Services Hub starts a web service workflow instance, the instance has the same name as the other workflow instance.
When you enable a workflow as a web service, the Workflow Designer enables the workflow to run concurrently by default.