The destroyedPart event signals that the part and its children have been destroyed. Any system resources associated with the destroyed parts have been released.

A lastError event indicates the last error that occurred has changed.

A programInput event signals a change in the input parameters for the program.

A programName event signals a change in the name of the program to run.

A programType event indicates a change in the type of program you are starting.

A self event indicates that the value of the target part itself has changed.