High Quality Content by WIKIPEDIA articles! Tlen.pl is an adware licensed Polish instant messaging service. It is fully compatible with Gadu-Gadu instant messenger. The communication protocol is based on open source jabberd code, but it was modified significantly, making it incompatible with generic XMPP clients and servers. Among other features, Tlen.pl allows for voice chats, SMS sending and video conferences. The versions later than 4.0 allow for creation and usage of plugins. Since then more than 130 plugins have been created by the community. By April 2008 there were more than 1 500 000 registered users and 780 000 real users of Tlen.pl. Tlen is also integrated with the o2.pl mail system, which allows users to use mail in three domains: o2.pl; go2.pl and tlen.pl. It is possible to easily access the mail system from the application. Tlen.pl automatically checks the user's account and if there is any new mail, it shows a notification on their screen.

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