Why is it not advisable to mark tlc plates with a pen to indicate?

Give an example of a case where a two-way handshake to establish a connection could leave one side of the connection live while the other side does not believe there is a connection.

Brian wants to conduct an online search with a certain phrase. he intends to use the words books that belong to the 1800s in his search. how should he use the word that in his search?

Perform an online search about the booting process of a computer and list all the steps