Mixed and Absolute Cell References. To avoid this problem created by the relative cell reference A7, mixed and absolute cell references can be used, which prevent all or part of a cell reference in a formula from changing as it is copied. Absolute and mixed cell references are created by adding dollar signs ($) to a cell reference. For example, in the image above, the cell reference $A$6 in the formula in cell B2 is an absolute cell reference and $A2 is a mixed cell reference.
The point of sale (POS) is the time and place where a retail transaction is completed. It is the point at which a customer makes a payment to the merchant in exchange for goods or after provision of a service.
1 POS evolution will be top priority for a number of retailers in 2015. 2  The inability of retailers to provide a personalized customer experience is what makes the flexibility of new POS systems attractive. 3  New POS systems allow retailers to diminish lines and reduce customer service wait times. POS evolution will be top priority for a number of retailers in 2015. 2  The inability of retailers to provide a personalized customer experience is what makes the flexibility of new POS systems attractive. 3  New POS systems allow retailers to diminish lines and reduce customer service wait times.