what the start/finish dates actually mean
You set these for the items that need to be tested on your next visit, for example, down in this part of the world, we test factory/workshop items every six months. If I wanted to see what a client was going to need tested next month, I'd set the Start Date at 1/11/2014 and Finish at 30/11/2014. If there had been some retesting/new testing out of sequence, then I might set the finish date for end of April 2015. That would produce a list of all assets that required retesting in that period.
If you visual test items, you can select only those visuals due, full test only or all tests. If you don't specify a client & site, then it will produce a report that lists all items due in the specified time period