The namespace Device is the entry points to all objects related with the Device module.

The Device.Channel object lists all configured channels and its runtime properties

The Device.Node object lists all configured nodes and its runtime properties

The Device.AccessType object lists the defined access types and has options to execute synchronous calls on reading and writing to the device.

The following tags properties are updated based on the device module:

tag.tagname.DevicePoint: Device point address connected with this tag

See http://www.tatsoft.com/help/fs-2014/runtime/index.html for the complete programming reference on runtime objects