CheckAbort[expr, failexpr] evaluates expr, returning failexpr if an abort occurs.
CheckboxBar[x, {val_1, val_2, ...}] represents a checkbox bar with setting x and with checkboxes for values val_i to include in the list x.CheckboxBar[Dynamic[x], {val_1, ...
ColumnWidths is an option for the low-level function GridBox which specifies the widths to use for columns.
CopyDirectory["dir_1", "dir_2"] copies the directory dir_1 to dir_2.
CreateDirectory["dir"] creates a directory with name dir. CreateDirectory[] creates a directory in the default area for temporary directories on your computer system.
DefaultFormatType is an option for cells that specifies the format used for displaying expressions in a newly created cell.
DefaultInlineFormatType is an option for cells that specifies the format used for displaying expressions in a newly created inline cell.
DelimiterFlashTime is an option for cells and notebooks that specifies how long in seconds a delimiter should flash when its matching delimiter is entered.
Direction is an option for Limit that specifies the direction in which the limit is taken.
Directive[g_1, g_2, ...] represents a single graphics directive composed of the directives g_1, g_2, ....