separate instances of Thunderbird or Kmail

[O. Sinclair]

Gordon Schulz wrote:
> On Wed, 30 Jul 2008 12:57, O. Sinclair <o.sinclair at gmail.com> wrote:
> 
> [...]
>> So I am looking for a way to run a second instance of Thunderbird or 
>> Kmail that is totally separate and "unaware" of the "main" ones. 
> [...]
> 
> Am I missing an obvious point here or isn't that easily done changing
> Profiles in Thunderbird and/or KMail?
it is likely me who is unaware of the option - how do you do that?