Help needed to put requirements into uml format

Hi
I have got into the bad habit of reading the specification and going
straight into coding without doing any analysis or design, but all thats about to change! i have been reading some uml tutorials, but none seem relevant to the project i have at the moment, could anyone tell me whether i need to do uml use cases etc for it as it seems quite basic.
all i am doing is sending rmi messages between applications using different scenarios, ie across a network, on the same network etc etc, then i just get the system start time and stop time after ive sent 1000 messages and thats my result. uml wise, i obviously need an actor for the enginner running the programme, cant think of any more actors unless im missing something? then i need a use case of the messages being sent. do i need one for each scenario? h
help would be gratefully received
ness

If Use Cases don't make a lot of sense to you, don't feel that you have to use them. There's no point generating meaningless documentation that neither you nor anybody else is ever going to read...
The main point of Use Cases (IMHO) is in requirements elicitation. The diagrams look nice and simple, so you can show them to the client, and make them feel smart.
Actors are entities that are external to the system or sub-system being modelled. So an Actor could be a user, another computer system, or an external event (e.g. a particular date and time). Actors initiate interactions, so anytime you have a particular function (Use Case) that is triggered by an event, you should ask yourself where the trigger comes from.
Don't forget to add extra textual information to Use Case diagrams. I include information such as:
Iteration
Summary
Course of events
Alternative paths
Exception paths
Extension points
Triggers
Assumptions
Preconditions
Postconditions
Any business rules
Author and Date for any modifications to the Use Case
Needless to say, this is a lot of information, almost none of which is conveyed by the diagram itself. You may be better off creating a simple list of functions and filling in the above information for each, or maybe the Use Case diagrams will help you think about what the functions and interactions actually are.
Good luck.

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