Function:     notify

Purpose:      Connect to Hermes' notification socket

Category:     SYSTEM
  
File:         srvreq.c
 
Author:       J.P. Terlouw
 
Use:          fd = notify(mode);
                       int fd   - file descriptor on socket or zero if mode==0
                       int mode - 1: connect; 0: disconnect

Description:  When a task is connected to the notification socket, Hermes
              will send event messages over this socket. These messages
              are defined in taskcom.h and include messages regarding
              changes on user input keywords. The task must be prepared
              to read these messages.
              This function is not normally called directly from
              application code, but rather through ScheduleHerevent or
              utility routines which call the latter routine.
              
Updates:      Apr  8, 1997: JPT, document created.