WINDOWS OS
Window OS systems provide several files call DLLs (dynamic link libraries). These are collections of software code that perform common software functions. Its functions include displaying file open, file save, search and print dialog boxes. An application would like to take advantage of a DLL function first check with an API (application programming interface) to find out how to call the function. The application also passes along a specification for the type of information it expects the DLL to return to the application when the DLL has done its job. After all the function complete, the DLL puts the return information into memory and instruct Windows to remove the DLL routine from memory.
DATABASE
Database manager allow user to define a data type for the information that user would like to store. A record is a collection of data about a particular person, place or thing. The individual items are contained in fields. Several records with the same fields of information for entries constitute a table. Database manager carry out queries. These queries sort and filter the data to let the user see it from different perspective. Finally database manager present the data in a formatted, easy-to-read report. To create such report, the user need to storing data, creating indexes to allow fast sorting and relation in between fields so data from different table can be linked together.
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