Sharepoint 2013 : Installing and Configuring Windows Azure Workflow Server (part 3) - Testing and Verifying the Workflow Installation

Managing Web Application Settings

Administrators can manage how SharePoint 2013 interacts with the Workflow Server. These settings are configured using the Manage web applications link in the Application Management section of Central Administration. On the web application page, choose the web application to govern, click the General Settings button, and select the Workflow option, which will take you to the dialog shown in Figure 14. The following options can be enabled:

FIGURE 14

• Enable user-defined workflows for all sites on this web application? — Use this setting to enable or disable user-defined workflows (created by SharePoint Designer 2013). This is enabled by default.
• Alert internal users who do not have site access when they are assigned a workflow task? — Sometimes, users may be assigned a task within a site to which they do not have access. Use this setting to toggle alert notifications on or off. This is enabled by default.
• Allow external users to participate in workflow by sending them a copy of the document? — When enabled, this allows a copy of the document to be sent to external users. This is disabled by default.

You can also configure these settings via PowerShell:

Set-SPWorkflowConfig -webapplication http://sitename
  DeclarativeWorkflowsEnabled $true
  -EmailNoPermissionParticipantsEnabled $true
  -SendDocumentToExternalParticipants $false