Resources, presence and routing?

Hello All....

I currently have Exodus on three systems I regularly use here at work.  
Each one has a different jabber resource name.  I was wondering how the 
server decides which resource to send a message to.  ie.  I'm 
douglask-/[email protected]  I have two online resources (/work1 and /work3).  
How does the jabber network decide where the next message someone sends 
me goes to? 

It's not uncommon for me to be using one system (eg work3) and have 
exodus/jabber route incoming messages to another resource (work1). 

I'm mainly wondering if the end user or the client has any control over 
where the messages are routed to, and if so, how can one ensure that 
messages go to the resource with the shortest idle time?

---Douglas