This Post Details Content That I Have Written Regarding The SharePoint API On MSDN. The Full Article Will Have These Contents As Annotations Of The Full Article.
I Encourage You To Read The Full MSDN Class Documentation, Since Things Like Type Hierarchy Are Illustrated.
Adam Buenz’s MSDN Located At Annotations edited by Adam Buenz – MVP:
Description The Microsoft.SharePoint.WebControls.PostCacheSubstitutionText class inherits from the System.Web.UI.Control class providing required functionality for ASP.NET server controls. Understanding the use of the PostCacheSubsitutionText control is heavily related to the difference between fragment caching, where a small portion of the page is cached, as opposed to Post-Cache Substitution where the entire page is cached, except a much smaller segment that is kept dynamic.
Read My Complete MSDN Article: PostCacheSubstitutionText