<snip>

Well lets take a step back, what are we trying to do? We are trying to
download only things which have changed. 

So what do we need to do this? A way to figure out what has changed.

What type of changes can occur?
 - Object is created
 - Object is destroyed
 - Object changes

A change can occur any time, IE A person puts a new order on an object
is a change. (This means modification times must be a unix time stamp.)

I think it's safe to assume that the server clock never goes
"backwards".

A client needs a way to ask "what has changed since the last time I
asked?".

Downloading all the object IDs and object modtimes seems very
inefficient.

What do you think would be the best way to do this?

Tim Ansell

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