If the squiggly line you are looking at is above the note, then we call that a mordent. It is a small squiggly line that is horizontal and placed directly over the note. A mordent is a musical symbol that tells the player to use two notes and play them rapidly together.
He/She may be unable to operate the system without reading the documentation. He/She may get poor grades as a result of being unable to operate the system. He/She may get shouted at for not being able to operate the system.
