Loop on second alignment

[[Lu...]]

Hi, I would like to know how it is possible to implement a loop for a second alignment (not the base alignment).
For the base alignment, we use the condition baseSystem().valueA < 0.005.
How can something similar be implemented for this second alignment?

[[Ke...]]

"differenceSystem()" for secondary 

[[CA...]]

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So, right click to access the loop option of the secondary and use differenceSystem in the condition?

Simple. Great to know thanks to Luca for the ask and thanks to Keith for the answer.

[[Ri...]]

Doesn't the differenceSystem() essentially check the difference of the alignment to the main alignment? I felt like when I tried to use it years ago it always showed large values, so if it was a completely new origin, you will never achieve what you want/need. 

[[Th...]]

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That or there's no iteration of the calculated alignment. Either way, I don't believe valueA on a secondary alignment ever changes with loops.