You should probably look into migrating to Eikon 4 field naming scheme. Eikon 3 is obsolete, I believe there should not be any Eikon v3 left in the field by the end of the year. And while there's no set date yet for complete retiring of Eikon 3 field naming scheme, it is bound to happen. This said, using Eikon 4 the closest you can get to viewing complete Eikon 3 field naming scheme is from the Quote List app in Eikon application. Double click on a column header in the Quote List app opens a dialog containing categorized Eikon 3 field naming scheme. Through this dialog it's hard to figure out what parameters and values for those parameters you can use in DEX2 library. Some of the parameters such as the ones that allow the retrieval of timeseries are specifically excluded from this dialog. But this is the most you can get using Eikon 4.