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=== Change if exists ===
In this example let's pretend 'bob' is a Client module variable. Client when started will create 'bob' with a default value in the 'global' context.
* Variable 'bob' doesn't exist, and 'bob' is not the name of anything else.
<kua>
> bob
Unknown: bob
</kua>
* Tries to set variable 'bob' to 'fred'. Fails as 'bob' does not exist. Which is good.
> bob fred
* Using the 'client' context run the Client 'start' command which will create the variable 'bob' with a default value of '8080'.
> client start
* Same as the first example, but now 'bob' exists.
'bob' is '8080'
* Try to set existing 'bob' to '8081', value changes.
> bob 8081
'bob' is '8081'