Declarative - set up in Workflow Rules
Don’t have an option for when Workflow Rules are discontinued (if ever)
Asynchronous
Fire and Forget
SOAP based (see https://tddprojects.atlassian.net/wiki/pages/createpage.action?spaceKey=SF&title=SOAP%20vs%20REST&linkCreation=true&fromPageId=1310556236 ) uses the WSDL and sends in XML
Only work on one object.
Can send the Session ID plus any fields on the Object.
After 24 hours messages are dropped from the queue
No set order. If they fail, messages may be retried out of order.
Has a unique Notification ID
Message may be delivered more than once.
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