Thursday Morning Riddle

I’m instructions that lead to no end when complied;
Found on ties when they’re tying, and shoes when they’re tied;
To invert in a plane or amusement park ride;
And the circle of people that’s on the inside.

Who am I?

UPDATE: Riddle solved by Brian. See comments for answer.

2 Responses to “Thursday Morning Riddle”

  1. Brian Says:

    Loop!

  2. Bill Says:

    LOOP is correct. Way to go, Brian!

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