File Extension DTD

The DTD file extension is a settings file in ICQ6. ICQ is a computer program for instant messaging that was first developed by Mirabilis, an Israeli company. Today, it is a subsidiary of AOL. The initial version of ICQ was launched in November 1996 and was one of the first in providing instant messaging service. This tool for personal communication enables users to meet on the net and interact using services for instant messaging such as voice, text, VoIP and video. Other features include offline support, free SMS sending on a daily limit, file transfers, multiplayer games, greeting cards and multi-user chats. ICQ was launched in April 2007 and was a major update from ICQ 4. The files with the .dtd file extension define settings files used with ICQ 6 that allow the users to configure various options available in the instant messaging tool. The application's user interface has been designed using Boxley, a rendering engine also used with AIM Tritron. The modification gives an additional feature that allows the user to send instant messages straight from the contact list. IM provides efficient and effective communication because of the immediate receipt of the message or reply.