Figure 1.
As shown in the screenshot, from the Table Browser Interface, one can select essentially any table in the UCSC Genome Database and obtain descriptions of the table's fields as well as download all or part of the table's records in a variety of formats.
Figure 2.
Subroutine Calculating Intronic Lengths, Illustrating C Structures, and Library Routines from the Kent Source Code Tree
Subroutine is part of the sample program in Dataset S3.