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 At the core of a POS system is a standard computer running specialized software and hooked up to a cash drawer/machine, a monitor and a receipt printer; depending on the price, a POS system may also include a bar code scanner and a credit card reader.hopping for a point of sale system: 1  Check for businesses (similar to yours) that are closing and may be selling relatively new POS systems; used is always cheaper than new. 2  DataMaxSys.com and ReSourcePOS.com sell refurbished systems.