Understanding Society User Support

Hi,
I am Maria, a PhD student in Sociology at University of Essex.
I have some questions about documentations and data available.
I was wondering in which datafiles I can find the variables showed in the modules for wave3.
In my case, for example, where can I find the grid.variable Emboost that appears in the list of the grid variables in the Modules section on the website in the datafiles?
I need them because the route of many variables referred to them and I would like to see their tabulation.
Many thanks,
best
Maria