Administering a system remotely can be done for a workstation
booted off its serial port A or port B. This can be done with
direct connections (dumb terminal or sparc station) or 
indirectly using telnet. In the latter case, a serial connection
from A or B must be made to a Network Terminal Server or Contentrator.
(Telneting to a pseudo-tty will not allow sending a break signal
as it is not a console device.)
 
1) Using telnet:

   telnet to host and log in. To get to the 'telnet>' prompt
   press:

         <ctrl>-]

   Then type:
 
          send brk           
   or
          send break   (depending on terminal concentrator requirements)


2) Using a direct connection to generate a BREAK signal on the line:

   Use either 'kermit' or 'tip' (in a shell tool) to connect
   to /dev/cua/a. The connection is made via a null-modem serial cable
   to the A or B port of the workstation to be administered.

   If using 'tip', press <RETURN><TILDE><POUNDSIGN> 

           <CR>~#

   In 'kermit', the sequence is control-backslash-B 

           ^\B


See also the OpenBoot Command Reference Manual - Appendix A, "Setting
          Up a TIP Connection"