Foreign Language Support

If you develop AutoLISP programs that can be used with a foreign language version of AutoCAD, the standard AutoCAD commands and keywords are automatically translated if you precede each command or keyword with an underscore (_).

(command "_line" pt1 pt2 pt3 "_c")

If you are using the dot prefix (to avoid using redefined commands), you can place the dot and underscore in either order. Both "._line" and "_.line" are valid.