Users use General Journals (or, some time they are called Financial Journals) to input (fill in) the data for future posting. Then, when they post this data, it disappears from the journal but then appears as posted data in the other ledgers. It can be General Ledger (or G/L Entry table), as well as in addition other ledgers (e.g., Customer and Detailed Customer Ledgers, VAT ledger, etc.) - depending on the nature of the posting. As you correctly mentioned, the General Ledger is meant to keep T-accounts information (as well as some other additional information, such as e.g. dimension values, transaction numbers, source ids, etc.).
However please note that users also fill in and post transactions via other documents - e.g., sales and purchase invoices, etc. - however when the posting takes place, NAV anyway pushes the posting procedure through the same General Journal posting procedure.
When user makes a posting that results in General Ledger records (T-accounts), a separate special table is also filled, and this is G/L Register. You can refer to it as a sort of a log that shows which user had created certain entries and when, and how they were created. Normally, users are not interested in this information, unless they would like to reverse one full register for some reason. Refer more to G/L Register information: msdn.microsoft.com/.../hh171493(v=nav.90).aspx
So, referring to your question: when you post the General Journal, this info disappears from there. The result of the posting you would see in General Ledger, and the information about who had done certain entries and when you will find in G/L Register.