diff -r 149b604c319b -r 93a75e48819c data/dictionary.xml --- a/data/dictionary.xml Sun Aug 11 13:42:41 2013 +0200 +++ b/data/dictionary.xml Sun Aug 11 15:48:08 2013 +0200 @@ -43,6 +43,7 @@ + a technique used in charging; for pre-paid subscribers the standard way to charge services is online – subscriber's balance is checked in the billing system and if sufficient, the service (e.g. sending a SMS) is provided, otherwise the service is denied; if the billing system is not currently available (so we can't say if the subscriber's balance is high enough), we can provide the service anyway and try to charge it later; @@ -110,16 +111,21 @@ - + + + + a kind of electronic communication between two persons or a group chat; + compared to e-mail, IM messages are short (few words, sentence) and the other side is expected (depending on his/her online status) to read and respond it immediately; + compared to SMS, IM messages are cheap – typically free of charge; + important IM feature is presence – the sender knows current status of the recipient: online, offline, away, busy etc.; + IM is rooted in the computer world but nowadays it is often used also on mobile phones as alternative to (expensive) SMS – in such case it is called OTT and requires mobile Internet connectivity; + IM messages are usually transferred over an TCP/IP protocol – good example is Jabber/XMPP which is free and open protocol for IM and presence based on XML + + computer messaging - - - messaging - -