Most communication is verbal, but often a simple hand gesture or aiming of the bow can be more clear. The rules only require that you hail in three situations. Other hails help to establish right of way or onus in tactical situations. These merely help to communicate that there is or is not an overlap at two boatlengths. Preventive hails are used to avoid near-future confrontations.
Tactical hails communicate intentions or desires to another boat.
It implies a tack into a lee-bow position if the answer is negative. Basically, port should never cross unless they get a clear response from starboard. Screaming at another boat might intimidate them into giving way, but it leaves a bad taste in everyone's mouth. This implies that I now have to give you a break the next time. If you think I fouled you, protest me or tell me not to worry about it.