The ESP Native APIs consist of C language headers, function prototypes, structure definitions and defines. They are divided into one of these areas.
|ESP||Embedded Server Pages API|
|EDI||Embedded Database Interface API|
|Http||Http Client and Server Library API|
|MPR||Multithreaded Platform Runtime API|
|OSDEP||O/S Dependent layer|
Rather than providing a blanket backwards compatibility guarantee, APIs are classified according to their stability. These Stability Classifications should assist developers in migrating to new versions of ESP.