Summarized from English documentation by Gal Kaminka:

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===            libsclient ver 3.03 1997/4/1 NODA Itsuki             ===
===                Library for Soccer Client                        ===
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Function:       init_connection
-----------------------------------------------------------------------
 init_connection() initializes and opens a UDP/IP socket to the
specified `host' machine at `port'.

Function:       send_message
-----------------------------------------------------------------------
  send_message() sends a charactor string in `buf' to the server
specified by `sock', which usually is created by init_connection().

Function:       recieve_message
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  receive_message() receives a message from the server specified
by `sock'. This function receives an oldest message one by one.  Compared 
with this, receive_info() receives a newest message, and discards older 
messages than the received message.

Function:       close_connection
  close_connection() close the socket specified by `sock'.
Usually, `sock' is created by init_connection.

Function:       recieve_info
  receive_info() receives a newest message from the server specified
by `sock'.  This function receives a newest message, and discards older 
messages than the received message, while receive_message() receives a 
oldest message one by one.

Function:       scan_info
-----------------------------------------------------------------------
  scan_info() parses and analyzes a message in `buffer' sent from
soccerserver, and puts the result into `sinfo'.  

Function:       scan_visual_info
-----------------------------------------------------------------------
  scan_visual_info() parses and analyzes a visual information in `buffer'
sent from soccerserver.  The result is put into `sinfo' (a structure).


Function:       scan_auditorial_info
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  scan_auditorial_info() parses and analyzes a auditorial information in `buffer'
sent from soccerserver.  The result is put into `sinfo' (a structure).

Function:       send_com_init
-----------------------------------------------------------------------
  send_com_init() sends a "init" command to soccerserver.

Function:       send_com_reconnect
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  send_com_reconnect() sends a "reconnect" command to soccerserver.
It returns the same InitInfo struct as send_com_init().

Function:       send_com_move
  send_com_move() sends a "move" command to soccerserver.
It moves client's player to (x,y) position in the field.
This commands is available only when the playmode is BeforeKickOff.

Function:       send_com_turn
  send_com_turn() sends a "turn" command to soccerserver.
The angle of turn is specified by `moment'.

Function:       send_com_dash
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  send_com_dash() sends a "dash" commands to soccerserver.
`power' specifies the amount of power of dash. 

Function:       send_com_kick
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  send_com_kick() sends a "kick" command to soccerserver.
`power' and `dir' specify the amount of power and direction of kick
respectively.

Function:       send_com_say
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  send_com_say() sends a "say" command to soccerserver.

Function:       send_com_change_view
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  send_com_change_view() sends a "change_view" command to soccerserver.

Function:       estimate_current_pos
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  estimate_current_pos() estimates the current position of the player
(absolute position (pos) and absolute direction (dir) in the field) 
from seen landmarks.