Labels:text | screenshot | number | font | line OCR: WINSOCK API OWNS SIN Additional services Web browser Telnet, tn3270.1h5250 Multimedia Custom applications Newsreader (NNTP) RPC Winsock TCP UDP Ethornet. Token Ring, d'al-ip (PPP, SLIP; Dedicated or switched flink to ISP point of presence Internet Figure 1. The Winsock application programming interface smoothes over the differences among applications for the protocol stack and among protocol stacks for the application. Thus, users can be confident that a new application will work on their Winsock-compliant computers and that their old applica- tions will work if they replace the protocol stack.