四分律行事鈔資持記 1.1107

1.1107

對首中，前安居。標云通諸界者，謂作法自然；或聚落蘭若，或僧坊俗舍，並通安居故。今下，標今立法。

In face-to-face, regarding the earlier rains retreat: 'Applying to all boundaries' means that the ritual procedure is natural: whether a village or an araṇya, or a monastery or a secular house, all are applicable for the rains retreat. Under 'now...', it marks the establishment of the present method.