How to get complete list of the responder services provided by Indesign?

I need export respond service particularly .

In sdk solution documention  following method is suggested

1. Search the public API headers for the string “kServiceIDSpace.” This gives the complete set of services

available (only a subset of which are responder services). For example:

DECLARE_PMID(kServiceIDSpace, kComponentVersionService, ...)

DECLARE_PMID(kServiceIDSpace, kMenuRegisterService, ...)

...

2. Search the results above for the string “Resp”. .

3. This yields the list of ServiceIDs for the predefined set of events that the application makes available

for responders to register interest in.

can anyone explain these step in detail particularly  first one