If you’ve missed out any storyline or conversation while you’re busy battling away the enemy, it’s alright. You could press SHIFT+Tilde and a panel will appear. This panel is a system panel and does not interact directly with other panels such as officer’s dossier, strategic map and so on.
Basically, this panel serves as a log of important messages that you might have missed. The list of items are added to the top first, which makes it easier to see.
Note: The tilde key looks like this ` and usually has a shift key that looks like this - ~ . This is key is usually located beside the 1 key. (not numpad 1).