Systems and techniques relating to electronically managing public resources are described. At first, a hole having a bottom is formed in a sheet, and the hole is filled with a metallic paste. Alternatively, the user can select a completion candidate to be the basis of a search for a refined list of completion candidates. The value of the coins and the number of coins within each denomination are displayed as the coins are counted. Span port oversubscription, incomplete span configuration, incorrectly placed network taps and monitoring device packet drop may thereby be detected and reported as data gap. Sensors for measuring the operating parameters of the system and an operator interface module can influence the operation of the system.