noun
interpersonal messaging service
Rare computing term for a service that enables direct messaging between individuals, as opposed to broadcast or group communication.
このシステムは個人間メッセージ通信サービスを提供している。
This system provides an interpersonal messaging service.
A broader term for any messaging service; 個人間メッセージ通信サービス specifically emphasizes person-to-person communication.
Refers to real-time text chat; 個人間メッセージ通信サービス is a more formal, technical term that may include non-real-time messaging.
Compound of 個人間 (between individuals), メッセージ (message), 通信 (communication), and サービス (service). A modern technical coinage.