Part Four of PHP codings formulated by Segun, as described, at the back of volume 18. Query results showing PHP codings to: (1) Last 20 patients seen in October 2010. (2) Appointments before 1050 hours and after 1730 hours in October 2014. (3) Patients seen in October 2010 who had similar entered complaints entries as those seen in October 2009, each of them in both months having consultation time of more than 10 minutes. JanuaryConsultationDatabase and OnCallDatabase codings which are required for the appropriate C#.Net codings. Comments about Forms design and insight into the appreciation of the message of the project specified in all the 19 volumes.