Several of the methods and functions of the API can throw exceptions if they fail or encounter exceptional circumstances. All of these are of the following type:

An exception contains a text message indicating the nature of the problem encountered.

As there is no notion of exceptions in C, the C API provides an analogous means to verify if a C SDK function succeeded. To check for the success of a C API function, call the AP_CheckException() function after a C API function call, and make sure that it returns AP_TRUE.

All client APIs are thread-safe, unless otherwise specified, in the sense that you can call API methods from any thread. Several background threads are created during the usage of a client API. Events received from a correlator will be handled in one of background threads, so you cannot assume that events will be delivered to you on any particular thread.