XLDyn™ uses patented technology so your model works as well as it looks. This is particularly true for SysML models. You can, for example, link values in a SysML constraint block to a worksheet, do some calculations, then use the worksheet as a middle person to update the model. We also provide a check-in/check-out mechanism so when you share a workbook there's no confusion about the gold source.
Please take a look at some of these pictures to gain a better understanding of how XLDyn™ works.