I/O control requests Datakit automatic dialers file descriptor file name file system file system type gateway machine intermediate modules IP packets IPC routines kernel code name translation network connection network server multi-player game port number s remote file system server process special file stream terminal processing user id /cs c /etc/netcaller program f /etc/utmp file f ipclisten S ipcopen S auth c con c ipcaccept S ipccreat S ipcreject S login S mount S pi C pipe S I read S recvfile S remote mail remote login remote system rlogin c I select c sendfile S service manager socket TCP/IP uucp file-transfer f vismon c I write S Interprocess Communication g Establishing Communication s New System Mechanisms s Generalized Mounting s Passing Files s Talking to Users s Network Calling: Simple Form s Process Connections Connection Server Addresses s IPC Implementation s Network Managers Service Manager I phone S I dk S I tcp S Ethernet