Absolute and Relative Effects

We have used Step / Chases to turn on/off colored lights very effectively but now want to develop our FX skills with MLs. The book notes the ABS tell the ML where to proceed using absolute points (XY). The Relative FX though sets any new point relative (referenced) to the current position. I'm a bit hazy whether we should use an ABS or a REF to swing a ML around. A couple of examples using these effects would help.

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