Stock levels and alerts

Hello all
I am pitching to develop a new e-commerce site and I think I want to use Open Cart. I have just had a meeting with the client and they have a couple of questions that I cannot find answer to regarding stock control:
So when they add stock, they can add the quantity they have. How do they know when they need to reorder? Does the system have a function to keep them updated when certain stock reaches a low level?
Thanks
j

A small mod will add it: Out of stock email alert.

Outstanding!
Thanks very much

An alert on mininum stock level (threshold) per product would also be a nice mod. Adding a default threshold is not that complicated, adding minimum stock levels per product seems to be more complicated, but not impossible to realise.

Regards,

24-7-open

it would be useful, if the critical stock level could be configured per product. The current critical level (10) could be left as default value...