CellTags is an option for Cell that gives a list of tags to associate with a cell.
CopyFile["file_1", "file_2"] copies file_1 to file_2.
CreateDirectory["dir"] creates a directory with name dir. CreateDirectory[] creates a directory in the default area for temporary directories on your computer system.
DeleteDirectory["dir"] deletes the specified directory.
DeleteFile["file"] deletes a file. DeleteFile[{"file_1", "file_2", ...}] deletes a list of files.
NotebookClose[notebook] closes the notebook corresponding to the specified notebook object. NotebookClose[] closes the current evaluation notebook.
NotebookDelete[notebook] deletes the current selection in the notebook corresponding to the specified notebook object. NotebookDelete[] deletes the current selection in the ...
Notebooks[] gives a list of notebooks currently open in the front end.
RenameFile["file_1", "file_2"] renames file_1 to file_2.
VectorDensityPlot[{{v_x, v_y}, s}, {x, x_min, x_max}, {y, y_min, y_max}] generates a vector plot of the vector field {v_x, v_y} as a function of x and y, superimposed on a ...