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Data retrieval serves two purposes:
Retrieving historical data on an instrument,
Fixing bad ticks, gaps, stock splits, or other problems on your server (or Personal Edition software).
Data Retrieval is initiated in a chart window by clicking on the Refresh
Data button 
in the tool bar.
The process initiated by clicking the Refresh Data button depends on the operative data feed. On S&P Comstock and DTN, clicking on the Refresh Data button initiates a call to the Aspen central database. On Reuters and MoneyLine, clicking on the Refresh Data button initiates a call to the Reuters or Moneyline central database, respectively. Note also that Personal Edition software is available only on S&P Comstock and DTN.