HEIDENHAIN CNC Pilot 4290 V7.1 - Manual (Page 326)

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4.35 Conditional Bloc
k Run
Skip level /..
An NC block with prepended skip level is not executed if the skip level
is active. Activate/deactivate the skip levels in Automatic mode.
In addition, you can use the skip cycle (deletion cycle) (set-up
parameter 11: deletion level/cycle). Skip cycle x activates the skip level
every xth time.
Example: /1 N 100 G...
N100 .. is not executed with active skip cycle 1.
Slide code $..
An NC block preceded by a slide code is executed only for the
indicated slide. NC blocks that are not preceded by slide codes are
executed on all slides.
For lathes equipped with one slide or with program heads
containing only one slide, a slide code is not necessary.