Command EXEC
EXEC file   
     &1 &2 &3 &4
     &5 &6 &7 &8
     /
     PDS()  
     USER() 
     BEGIN()
     LIST   
     NOTERM 
Purpose
  Execute a command script file
Function
  Command script files consist of a list of commands, one per line.
  Lines starting with * or /* are comment lines.
  Up to eight symbolic parameters may be specified to allow text replacements.
Remark
Example
  Given a command script file time.exec:
  *
  *
  TIME &1
  the command
  exec time.exec on
  will execute
  TIME on
Parameter file
Name of the command script file
Parameters &1,&2,&3,&4,&5,&6,&7,&8
These optional parameters, identified by their position in the command string, specify text to be replaced in the file.
They correspond to the placeholders  &1, &2, &3, &4, &5, &6, &7 and &8 in the command script file
Parameter USER()
Not yet implemented
Parameter PDS()
Not yet implemented
Parameter BEGIN(label)
If specified execution begins with the statement
STOP label
in the command script file.
Parameter LIST
Don't execute commands, just list them on terminal
NOTERM
Quiet mode, don't list commands on terminal