This version of the HSpot manual and on-line Help has gone through a deep and very extensive revision from the Guaranteed Time Call versions, which will continue as HSpot reaches the Open Time Call version (5.0), in which extensive updates will include detailed post-launch knowledge and updates, particularly in the instrument chapters.

In the 3.x version, the information about installation, requirements and supported platforms has been completely revised. My thanks are due to Rafa Andres for sorting through the information very carefully and helping to update it and for answering many questions about the latest updates to HSpot. The instrument-specific chapters (9-12) have also been extensively revised by Tony Marston and the Instrument and Calibration Scientist Team to take into account the many new features that have been included since the Guaranteed Time user release of HSpot. The rest of the manual has been revised line-by-line and both the text and the screenshots updated. This reflects both the many tweaks and improvements made at the HSC to fix bugs and increase functionality and the constant updates in the Spot Core made at IPAC.