IP Messenger

IP Messenger is an instant messaging application for local area networks. It allows the exchange of messages and files between computers on the same network without the need for a central server. The tool automatically detects other users on the network who have the program installed.

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• Automatic user discovery. The client scans the local network and displays a list of all workstations with IP Messenger active. The list includes the hostname, IP address, and workgroup, updating in real-time based on device availability.
• Message exchange. Core functionality for sending and receiving text messages between users on the LAN. Messages are delivered directly between the involved computers, using the TCP/IP protocol for communication.
• File transfer. Ability to send single or multiple files to other users on the network. Supports dragging and dropping files directly into the conversation window to start the transfer immediately.
• Folder sending. Allows transferring entire directories with their complete internal structure. The tool preserves the file hierarchy during the sending and receiving process.
• Screen capture and send. Integrated utility to capture specific regions of the screen and send them as an image in a message. Supports multiple captures combined into a single message.
• Message encryption. Optional security system that encodes message content during transmission. Implements encryption algorithms to protect communication confidentiality.
• Password protection. Authentication mechanism requiring a key to access received messages. Prevents unauthorized individuals from reading the content of communications.
• Status indicator. System that shows user availability with customizable states. Includes automatic detection of computer inactivity and corresponding status change.
• Message history. Complete log of all conversations and transfers made. Stores the message timeline with date and time for later consultation.
• Transfer monitoring. Tool displaying the progress of file sends and receives. Provides detailed information on transfer speed and estimated time remaining.
• Unread messages. Temporary storage of received messages while the user is away. Messages remain accessible until opened and read by the recipient.
• Priority levels. Configuration that determines the urgency of messages and transfers. Establishes different categories to manage the attention required for each communication.
• Font customization. Options to modify the font type and size in the interface. Applies changes both to the user list and the message editing area.
• User search. Function to locate specific contacts within the list of connected users. Filters results by hostname, group, or IP address.

IP Messenger was originally developed by Shunji Hiramatsu in 1996. The program was created specifically for use on Japanese corporate local networks. The application is written in the C++ programming language and uses the UDP protocol for user discovery on the network.

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