Autodesk AUTOCAD 2006, Command Reference Manual, Page: 585 / 1490

JOIN
Joins objects to form a single, unbroken object
Modify toolbar:
Modify menu: Join
Command line: join
Select source object: Select a line, polyline, arc, elliptical arc, or spline
Depending on the source object selected, one of the following prompts is
displayed:
Line
Select lines to join to source: Select one or more lines and press ENTER
The line objects must be collinear (lying on the same infinite line), but can
have gaps between them.
Polyline
Select objects to join to source: Select one or more objects and press ENTER
The objects can be lines, polylines, or arcs. The objects cannot have gaps
between them, and must lie on the same plane parallel to the UCS XY plane.
Arc
Select arcs to join to source or [cLose]: Select one or more arcs and press ENTER
, or enter L
The arc objects must lie on the same imaginary circle, but can have gaps
between them. The Close option converts the source arc into a circle.
NOTE When joining two or more arcs, the arcs are joined counterclockwise
beginning from the source object.
Elliptical Arc
Select elliptical arcs to join to source or [cLose]: Select one or more elliptical arcs
and press ENTER , or enter L
The elliptical arcs must lie on the same ellipse, but can have gaps between
them. The Close option closes the source ellipstical arc into a complete ellipse.
NOTE When joining two or more elliptical arcs, the elliptical arcs are joined
counterclockwise beginning from the source object.
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