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I think what you are looking for is overlapped clerks. That way a clerk can start a transaction (not necessarily a tab), take their key out, someone else can do a sale, then the original clerk can put their key back in and carry on with their sale. The tabs can be set in two ways. First, they can be set so that anyone can open a tab, add items then store it, then anyone else can come along and add to that tab. Secondly, they can be set so that only the clerk that opened the tab can add to that tab, (hope this is all making sense!). To make these changes though, you'll need a service key. The other problem could be lack of memory. If your 700 hasn't had extra memory put in and you're using tabs you'll be lucky to get three overlapped clerks.
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