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The following tables compare general and technical information foris a numberlist of [[instant messaging protocol]]s. Please see the individual protocols' articles for further information. This article is not all-inclusive or necessarily up-to-date.
==Initiative==
==General information==
!style="background: #ececec;"| *[[.NET Messenger Service]] ▼Basic general information about the protocols: creator, version, etc.
*[[OSCAR_protocol|OSCAR (AIM and ICQ)]]
{| border="1" cellpadding="1" cellspacing="0" style="font-size: 85%; border: gray solid 1px; border-collapse: collapse; text-align: center; width: 100%;"
*[[TOC protocol]] (AIM)
|-style="background: #ececec;"
*[[YMSG|YMSG (Yahoo! Messenger)]]
!
!Creator
!First public release date
!License
!Identity (not inc. alias)
!Asynchronous message relaying
|-
!style="background: #ececec;"| [[Bonjour (protocol)|Bonjour]]
| [[Apple Computer]]
| [[August]] [[2002]]
| [[proprietary software|Proprietary]]
| [[Username]]@[[hostname]]
| bgcolor=#ffdddd | No
|-
!style="background: #ececec;"| [[Gadu-Gadu]]
| [[sms-express.com]]
| 17 [[July]] [[2000]]
| [[proprietary software|Proprietary]]
| Unique number<br />e.g. 12345678
| bgcolor=#ddffdd | Yes
|-
!style="background: #ececec;"| [[Internet Relay Chat|IRC]]
| [[Jarkko Oikarinen]]
| [[August]] [[1988]]
| [[Open standard]]
| [[Nickname]]![[Username]]@[[hostname]]<br />(or "hostmask")<br />e.g. user!~usr@a.b.com <sup id="fn_1_back">[[#fn_1|1]]</sup>
==Third-party==
| bgcolor=#ddffdd | Yes
*[[Gadu-Gadu]]
|-
*[[Gale]]
!style="background: #ececec;"| [[Jabber]]
*[[Internet Relay Chat]]
| [[Jeremie Miller]]
| *[[May]] [[2000Jabber]]
| *[[OpenLotus standardSametime]]
*[[PSYC]]
| [[JID]]<br />e.g. usr@a.b.c/home <sup id="fn_2_back">[[#fn_2|2]]</sup>
*[[Session Initiation Protocol]]
| bgcolor=#ddffdd | Yes
*[[SIMPLE]]
|-
*[[Voice over IP]]
!style="background: #ececec;"| [[Meetro]]
*[[Zephyr protocol|Zephyr Notification Service]]
| [[Meetroduction]]
| 30 [[May]] [[2005]]
| [[proprietary software|Proprietary]]
| E-Mail address<br />e.g. user@host.com
| bgcolor=#ddffdd | Yes
|-
▲!style="background: #ececec;"| [[.NET Messenger Service]]
| [[Microsoft]]
| [[July]] [[1999]]
| [[proprietary software|Proprietary]]
| [[E-mail address]] ([[Microsoft .NET Passport|.NET Passport]])
| bgcolor=#ffdddd | No
|-
!style="background: #ececec;"| [[OSCAR protocol]]
| [[America Online|AOL]]
| ?
| [[proprietary software|Proprietary]]
| [[Username]] or [[UIN]]<br />e.g. 12345678
| bgcolor=#ddffdd | Yes
|-
!style="background: #ececec;"| [[YMSG]]
| [[Yahoo]]
| ?
| [[proprietary software|Proprietary]]
| [[Username]]
| bgcolor=#ffdddd | No
|-style="background: #ececec;"
!
!Creator
!First public release date
!License
!Identity (not inc. alias)
!Asynchronous message relaying
|}
<cite id="fn_1">[[#fn_1_back|Note 1:]]</cite> In <tt>~usr@a.b.com</tt>, the <tt>a.b.com</tt> part is known as the "hostmask" and can either be the server being connected from or a "cloak" granted by the server administrator; a more realistic example is <tt>~myname@myisp.example.com</tt>. The tilde generally indicates that the username provided by the IRC client on signon was not verified with the [[ident]] service.
<cite id="fn_2">[[#fn_2_back|Note 2:]]</cite> In <tt>usr@a.b.c/home</tt>, the <tt>home</tt> part is a "resource", which distinguishes the same user when logged in from multiple locations, possibly simultaneously; a more realistic example is <tt>user@jabberserver.example.com/home</tt>
[[Category:Computing comparison]]
[[Category:Instant messaging|*]]
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