Hole-Slot or Hole -Hole Strategy -Details needed

In computing terms the difference between hole and slot is that hole is a security vulnerability in software which can be taken advantage of by an exploit

Why to use a net hole and slot, and how to specify a net hole and slot

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slot online dado88 hole not a slot as needed by the part Is there a simple way of producing a slotted hole pad for this, any ides greatfully received Thanks