The ABAP Dictionary (SE11) defines the technical properties of a database table such as the name and the data type of each column. It is possible to define the syntactic and the semantic properties of a data type separately from each other, the semantic properties in the Data Element, the syntactic properties in the Domain.
Typical semantic properties are the field labels and the reference to a Search Help. So we know by now where the value help that seemed to appear by magic is defined: In the Data Element of S_CARR_ID. A Search Help defined there can also be used in a Web Dynpro ABAP application.
The Data Browser (SE16) is the place where we can get an overview of all the entries of a database table. We can navigate there via the ABAP Dictionary as we have seen, but we might, of course, also open another session, input SE16 as an ok code and enter the name of the relevant database table there.
The Parameters command is very simple to use and still a powerful means to create a UI for user input. But nowadays you should use it for test purposes only because it is based on classic technology.
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