   Parameters:  [meta-char-name [char]]|[mode-name [YES|NO|PREV]]
  
 Alters the command-language meta-characters and mode switches. 
  
 The  meta-characters  are the delimiter "DELIM" (which separates
 multiple  commands),  the  separator  "SEPAR"  (which  separates
 command parameters), and the null-number character "NULL" (which
 gives a  null  value  to a numeric parameter).  If the parameter
 "char" is omitted, the meta-character becomes disabled. 
  
 The mode  switches  include  the  print-verify  switch  "VERIFY"
 (which  controls  the  printing  of  a  line  after a command is
 processed),  the  "OK-error"  switch  "OKERR"  (which  continues
 command  processing  when  an  error  occurs), and the stop-mode
 switch "STOP" (which stops command-line, but  not  command-file,
 processing at "BOTTOM"). 
  
 Mode  switches  may  be set with a YES/NO or PREV (Y/N/P) value.
 The "PREV" setting changes the switch to its previous value.  If
 the YES/NO/PREV parameter  is  omitted  from  the  command,  the
 mode-switch setting is toggled (reversed). 
  
 When no parameters are specified, the "Alter" command prints the
 current values of the meta-characters and mode switches. 
