A global timer creates a task as soon as it is defined in the
process and the process is saved on the server. These tasks will be
listed and described in the Tools
A global timer will be used when a time-controlled event
plays a role in the process (such as reminding a user of overdue
reports every morning via email). A timer event handler can react to
these events in a process.
Start global timer
If a global timer is selected in the process, the timer can be manually
executed via the Start global timer job
This function is interesting, for example, if the actions that are
connected to the global timer are to be executed independently of the
set execution time.
IMAP event source
An IMAP event source
monitors a folder on and IMAP email server and generates an event, such as when an email message is received.
Generic event source
Java classes, even from third party providers, can function as generic event handlers as long as they implement the IWorkflowEventSource
Further information can be found here