In order for a high temperature boiler or steam engine to produce superheated water, or steam:the heat source must be greater than 100°Cthe system must be sealed and become pressurized above atmospheric pressurethe water must be permitted to evaporate quicklythe vapor pressure must be kept below 760 mm(Hg)

The statement you provided seems to be a mix of correct and incorrect information. Here's the correct step-by-step process for a high temperature boiler or steam engine to produce superheated water or steam:

1. The heat source must be greater than 100°C: This is correct. Water boils at 100°C at atmospheric pressure. To create steam, the water must be heated to a temperature above its boiling point.

2. The system must be sealed and become pressurized above atmospheric pressure: This is also correct. In a sealed system, the pressure can be increased, which raises the boiling point of the water. This allows the water to reach higher temperatures without boiling, which is necessary for the creation of superheated steam.

3. The water must be permitted to evaporate quickly: This is not necessarily correct. The rate of evaporation doesn't directly affect the production of superheated steam. What's important is that the system is sealed and pressurized, and the water is heated to a temperature above its new boiling point.

4. The vapor pressure must be kept below 760 mm(Hg): This is incorrect. The vapor pressure of water increases with temperature. In a sealed and pressurized system, the vapor pressure will be higher than 760 mmHg when the water is heated to the point of producing superheated steam.

So, to summarize, to produce superheated steam, you need a heat source that can heat water to temperatures above 100°C, a sealed and pressurized system that allows the water to reach temperatures above its boiling point, and a system that can handle the increased vapor pressure that comes with these higher temperatures.