If the option toFile=>fn with a String fn is given then mConvexHullFacesAndDuals stores the result in a file named fn.
This data can be read by the commands readConvexHullFaces and readPosHullFaces.
The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/ConvexInterface.m2:757:0.