conversa(An instant message or text message conversation between two or more participants); tópico(An instant message or text message conversation between two or more participants)
thread(A type of object within a process that runs program instructions. Using multiple threads allows concurrent operations within a process and enables one process to run different parts of its program on different processors simultaneously. A thread has its own set of registers, its own kernel stack, a thread environment block, and a user stack in the address space of its process)
