Passing control

Traditionally, the “client” (caller) branches to the “server” (callee) and waits until it returns
- exceptions: fork(), threads, parallel computing
RPC:
- the client locates the host in standard TCP/IP host lookup fashion
- the protocol (TCP or UDP) is written into the code
  - more often UDP than TCP
- gets the port from the portmapper
- sends packet & waits, just like HW #2