Client side

1. Create a buffer and send a message to the server containing opcode RECV_WORK_PACKET and the worker class id, which is stored in a global variable.
2. Block on a receive from the server task with a wildcard message tag (-1).
3. After receiving the message find out the message tag of the buffer received.
4. If the message tag is FARM_HAS_TERMINATED, then return the constant PvmFarmHasTerminated (a negative number).
5. Else, return the positive integer which contains the buffer id of the message received.