With a big jump from v2000 to v2014, you may look into these additional system variables which were introduced since 2014 version:
1) TRUSTEDPATHS
2) SECURELOAD
HTH
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A circle is the locus of a cursor, starting and ending at the same point on a plane in model space or in layout such that its distance from a given coordinates (X,Y) is always constant.
X² + Y² = C²