1      A control argument specifies some variation in the way a "command"
 2 normally performs its function.  For example, when the -directory control
 3 argument is given to the list command:
 4 
 5 list -directory
 6 
 7 instead of listing "segments" as it usually does, the command lists
 8 "directories." The hyphen before the word directory indicates that it is a
 9 control argument.  All control arguments are preceded by a hyphen.
10 Ordinarily, control arguments do not have to be typed in any specific order.
11 
12      Control arguments themselves sometimes take "arguments."  For example, the
13 enter_output_request command, which causes a specified segment to be printed
14 on paper, accepts several control arguments that require arguments of their
15 own.  When you want more than one copy of a printout, you type:
16 
17 enter_output_request my_segment -copy 3
18 
19 The argument to the -copy control argument is necessary to tell the command
20 how many copies to print.  Without that argument, the command will print only
21 one copy.  Arguments to a control argument are separated from it by one or
22 more blank spaces.
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