A configuration builder useful in configuring software-containing hardware units which are serviced by a center which services a multiplicity of similar units having a plurality of different configurations, the configuration builder including:

• functionality enabling configuration of at least one software-containing hardware unit by a configurer; and
• functionality operative automatically in response to configuration of the at least one software-containing hardware unit for correspondingly configuring the center, thereby to enable the center to interface with the at least one software-containing hardware unit.

  Methodologies and point of sale systems employing the configuration building functionality are also disclosed.