Final answer:
The sentence deals with the distribution of essential information which includes key details necessary for understanding or executing tasks. The example highlights that underlined words convey this crucial information.
Step-by-step explanation:
The sentence in question is concerned with the distribution of essential information and certain instructions. In the context provided, 'essential information' refers to details that are crucial and necessary for the understanding or execution of a task. This can be seen in the example sentence where it is mentioned that the underlined words in a given statement carry necessary information regarding the labs, indicating that such details are fundamental to the meaning of the sentence.