There are those info messages within the help (F1) menu. Those show for example when you're within a trigger and can perform a given action. But also the messages which tell you that you've to fill an implement first. This mod shows these messages in the upper left corner when you're hiding the help (F1) menu, so that you never miss an action, and don't have to show the help menu all the time. Normal messages are shown in white, if the message is related to an action it will be shown in yellow.