Orders come in through the cart and are being sent by email. Even if emails are not being sent out by the system (Joomla may have a configuration error) the orders are still recorded in the database.
In the backend the orders screen looks like this:
On this screen you have two clickable fields: the name and the email. The email can be used to send out an email to this customer using your standard email client (Thunderbird/Outlook/TheBat or any other). The Name field is used to edit/view the order in detail.
The order details look like this
The first part is the header info from the customer. The only thing you can change in an order is the Status. The Status dropdown list contains all the statuses you have defined in the Configuration panel.
The second part contains the details of all ordered products. In the last column of the items list the link called "Rem. from store" is used to decreased the quantity available in the store for each product. Be aware that the product will still be sold even if there is no more of it in store. SimpleCaddy has no way of knowing if you physically shipped the item or not.