A Superloop is a loop made up of four regular loops, if you notice on your shelf the numbering has supl on it (by the card slot numbers). When you program a Superloop you use the talk slots of four loops thats why next to a Superloop you may not have another Superloop card or a ENET card by you can use a MSDL or QPC841 card next to a Superloop card.
In load 97 is where you program Superloops. A Superloop 4 would use up loops 4,5,6,7 and can be placed in either slot that these loops would occupy, this is defined in ld 97. Go to ld 97
req= prt
type= supl
and return the rest of the way.
This might give you an idea on how your loops are define.
Hope this helps.