In Student CRM there are two slightly different ways to target manual campaigns to Students:

An 'Ad-hoc' via a specific App (like Prospectus Requests, Mobile Event Capture, Rapid Response, Pre-app Open Days or Applicant Open Days). Ad-hocs are created from a Search or Grab. 

A 'Campaign' via Student Database or Applications. Campaigns are created from Segments. 

The Ad-hoc system will eventually be replaced by Segments and Campaigns in each app.
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