Most, although not all, of the content and functionality available in DataScope Select is available in the REST API.
Attachments: Up to 2 attachments (including images) can be used with a maximum of 512.0 KiB each and 1.0 MiB total.
Update: bulk feeds are available now. Screener is planned for Q1 2017.
DSS REST API StatusCode 400 response
Use chain rics in the REST API
How can I get API token for access to reuters API ?
How to use DSS/REST API examples behind a proxy?
Sample C# code that excludes deleted items when pulling data from DSS Corporate Actions table