RemovePeriodical[id] removes the computation corresponding to the integer id from the set of operations that are periodically performed automatically.
SetComplexClass[classname] specifies the Java class to use for complex numbers sent from, and returned to, Mathematica.
SetField[obj@field, val] sets a value of an object field.
SetPeriodicalInterval[id, interval] resets the time interval for the periodical task with the given id.
UseFrontEnd[expr] evaluates expr in an environment where the kernel can make use of the services of the notebook front end.
UseJVM[jvm, body] acts like a wrapper that causes all J/Link calls in body to use the specified JVM as the default Java runtime.
$FrontEndInitializationFunction is a function that you can assign to execute when the front end link is first established by ConnectToFrontEnd[].
MLINK getMathLink (WolframLibraryData libData) gets a MathLink connection to use for evaluations in Mathematica.
Message
(Mathematica LibraryLink C Function) void Message (char*txt) issues a message from a library function.
int MTensor_clone (MTensor f, MTensor *t) is a library callback function that puts a clone of f into *t.