wall.  wall ("write all"   )   -
      .   
write,       wall   . 
 wall ,     ,    -
 . ,    ,   .
  wall       -
:      .

email.   (email)        
    /  .   -
    ,     . -
     ,    
 ,          
    .
      ,   
,    write  talk, , ,  -
  .       -
  -   ,      
  .

 .          .
   ,   /etc/motde.   
      ,
       - .

 

     ; -
    .      ,
    ,     -
,       .    -
 ,      ,    
   .     -
 .

   

       ,  -
    .      -
 ,         -
  .    ,    -
        .

     

      . 
    -  ,    -
 .   ,       -

556                                        IV.  