There are two basic kinds of page references in citations:

Inclusive pages
For works published as part of a larger work (articles in journals, cases in reporters, essays in collections), the “Inclusive Pages” for a work tells a reader the page on which the work begins in the larger work, and the page on which it ends.

When you are using Citation, inclusive pages are entered in your Citation records.

Note that for certain legal source works (cases published in reporters, for instance) only the "Initial page," needs to be entered.

Pinpoint reference
Pinpoint references tells a reader the specific location of a cited passage within the larger work. Pinpoint references are used in footnotes and intext citations (Author-Date, Page or Author-Page) referencing freestanding works, such as books, technical reports, journal articles and other works. A pinpoint reference is often a page reference, section, paragraph, or some combination of these.

When you are using Citation, pinpoint references are entered in Access keys in your document.

For many publishing styles, particularly those that use footnotes/endnotes, pinpoint cites are critical to the proper documentation of sourceworks.

Note that Citation program will include any text in your Access keys - including section symbols, paragraph symbols, and page numbers - following the colon (:) as a pinpoint cite in formatted citations in your document.

The Access key in your document consists of the Access phrase for the work cited, plus a pinpoint cite.

For example:
To cite page 920 in the article by Patterson, entered here as a Citation record:

We would enter the following Access key in our document:

{Patterson 1990: 920}

When we run the Generate Citations feature in Citation, this Access key will be replaced by a reference with the pinpoint cite. A footnote, for instance, might look like this:

L. Ray Patterson, Legal Ethics and the Lawyer's Duty of Loyalty, 29 Emory L.J. 909, 920 (1980).

An intext Author-Date citation might look like this:

(Patterson 1980, p. 920)

Generally, when you are using Citation, entering inclusive pages in the bibliographic record and the pinpoint reference in Access key allows you to cite specific pages from one source as many times as you like without duplicating records in your database.