What is a 'Screen Name' in Thunderbird's and SeaMonkey's address books?

[James Michael Fultz]

* Detlef Lechner <Detlef.Lechner at gmx.net> [2009-10-01 18:02 +0200]:
>Avi Greenbury wrote: 
> 
>> AOL Instant Messenger is an Instant Messenger system created by AOL. 
>> 
>> An AIM user's screen name is the name by which other users of the 
>> system may find them. 
>> 
>> http://en.wikipedia.org/wiki/Instant_Messaging 
>> http://en.wikipedia.org/wiki/AOL_Instant_Messenger 
> 
>I still do not understand what this has to do with the free E-Mail 
>programs Thunderbird and SeaMonkeys address book.

It's another form of contact like a telephone number.  It makes 
no less sense to allow for recording of a IM screen name in an 
email client's address book than it makes sense to allow for the 
recording of a telephone number there.

<https://wiki.mozilla.org/Thunderbird:Help_Documentation:Using_the_Address_Book#Contact_Tab>