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A stack can be easily implemented either through an array or a linked list, as it is merely a special case of a list. [19] In either case, what identifies the data structure as a stack is not the implementation but the interface: the user is only allowed to pop or push items onto the array or linked list, with few other helper operations.
The first and last nodes of a doubly linked list for all practical applications are immediately accessible (i.e., accessible without traversal, and usually called head and tail) and therefore allow traversal of the list from the beginning or end of the list, respectively: e.g., traversing the list from beginning to end, or from end to beginning, in a search of the list for a node with specific ...
On Windows 2000 and later, they contain the string Windows Registry Editor Version 5.00 at the beginning, while on Windows 9x and NT 4.0 systems, they contain the string REGEDIT4. [26] Windows 2000 and later REG files are Unicode-based, while on Windows 9x and NT 4.0 systems, they are ANSI-based.