Drei commands are standard CLIM commands that are stored in standard CLIM command tables. Drei uses a number of distinct command tables, some of which are merely used to group commands by category, and some whose contents may only be applicable under specific circumstances. When the contents of a command table is applicable, that command table is said to be active. Some syntaxes may define specific command tables that will only be active for buffers using that syntax. Commands in such tables are called syntax-specific commands.