I was quite pleased to discover today that the Software Toolbox TOP Server OPC now includes functionality to interface with GE Proficy iFIX through not just OPC, but a new, native iFIX process database driver called IDS, or Industrial Data Service:

With built-in support of the native interface, the TOP Server allows iFIX users to quickly access device data without the need to use an intermediary software bridge, i.e. the OPC Power Tool, as is done when using a strictly OPC only communications server with iFIX. For Intellution users, the familiar look and feel of iFIX native driver operation is maintained.

This transparently functionality is available through the new iFIX PDB settings menu under TOP Server options.