Constrains the distance between two points on different objects.
This command is equivalent to the Aligned option in DIMCONSTRAINT.
The following table outlines the valid constraint objects and points:
Valid Objects or Points 
Characteristics 

Line Polyline segment Arc Two constraint points on objects Line and constraint point Two lines 

The following prompts are displayed.
Specifies a constraint point for the object.
Specifies the first point of the object to be constrained.
Specifies the second point of the object to be constrained.
Determines where the dimension line is located on the constrained object.
Selects an object instead of a constraint point.
Specify Dimension Line Location
Selects a point and a line object. The aligned constraint controls the distance between a point and the closest point on a line.
Constraint Point
Selects a line object.
Specify Dimension Line Location
Selects two line objects. The lines are made parallel and the aligned constraint controls the distance between the two lines.
Select the first line to be constrained.
Select the second line to constrain the distance between the two selected lines.
Specify Dimension Line Location