The group starting with the Header keyword defines the title of the project. For the building model example the definition is like this:
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This is the header group with the title of the project.
The title can be a string of any length.
Header
Axi-symmetrical Building Model with Closely Spaced Modes
The red word is the case-insensitive keyword. The blue string is the entered project title. This group has only this single record with this single field. The green lines are comments, which can be placed between the definition groups, i.e. the lines before the keyword and after one free line which closes the definition group.