[ubuntu-za] Sources.list

[Wikus]

Evening guys ,

I have seen that the 3rd party software sources in the software updates 
app and in the /etc/apt/sources.list file is not the
same. Sources.list have entries that "other software" in the software 
app doesn't have and visa versa.
Why is this ? I always thought that sources.list and "other software" 
entries should be the same.
Which one of the two is used when Ubuntu automatically check for updates 
? Are both used ? And also which one
is used with manual apt-get update or is with that also both used ?

Thanx

Ubuntu 13.04 64bit

- Wikus

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