Also called "Chat Programs". These applications are installed on a PC by a user, and allow immediate "chats" between other users of the program. Some of these programs also allow audio or video conferencing as well as the ability to execute file transfers.
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The Chikka Messenger allows instant messaging from your phone. It unifies your mobile phone number and instant messaging IDs and checks for online buddies with just one SMS message. It receives instant messages on your mobile when you're away from your computer and sends multimedia messages from your PC to MMS-enabled mobile phones. The Txt2Mail application lets you send and receive e-mail from mobile phone users.
