SOAP data modules use Lock internally to ensure that all IAppServer calls are thread-safe. When implementing a SOAP data module descendant, call Lock before accessing any instance data, including the providers contained in the data module. When finished with the block of code that must be protected from thread conflicts, call the Unlock method to release the lock. 

Lock uses a critical section to guard against thread conflicts. This means that any code that accesses the SOAP data module's properties or contained objects must call Lock or it will introduce thread conflicts. 

Providers 

Unlock 

IAppServer 

TCriticalSection