A table at the beginning of each section explains API functions in EHLLAPI Functions, PCSAPI Functions, and WinHLLAPI Extension Functions. It shows whether a function is supported for the products that provide the function described in the section. Yes means it is supported for a host type, and No means not supported. For example, the following table indicates that a function is available for 3270 and VT sessions but not for 5250 sessions.

3270 5250 VT
Yes No Yes