Description: Downloadable computer software used to calculate and display real-time information about well conditions during drilling, namely, bottom hole pressure or any desired pressure point of the well, temperature, hydrostatic mud pressure and return-flow control during well planning, drilling, and rig operations in the oil and gas industry; electric well drilling surface tool comprising a pressure management device or manifold, rotating control device, choke and flow meters and valves to automatically manage downhole wellbore conditions and fluid circulation during oil and gas drilling operations; drilling machines and drilling tools therefor for use in drilling oil and gas wells; drilling and construction of oil and gas wells; advisory and consultancy services in relation thereto; "MPD"; providing temporary use of online non-downloadable computer software application for collecting required drilling data from the rig, to calculate real-time downhole pressure, and manage pressure from the surface by transmitting the information from internet enabled, wireless communications network and smart devices, namely, phones and tablet computers, to the electronic-operated surface tools which automatically choke back return flow during oil and gas drilling operations