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     Syntax:  !IF constantexpression
 
     Processes the statements between !IF and the next !ELSE or !ENDIF
     if <constantexpression> evaluates to a nonzero value.
     See: ◄!ELSE... Directives►
          ◄Expressions in Preprocessing►
 
     Syntax:  !IFDEF macroname
 
     Processes the statements between !IFDEF and the next !ELSE or
     !ENDIF if <macroname> is defined.
     See: ◄Macros►
          ◄Null Macros and Undefined Macros►
 
     Syntax:  !IFNDEF macroname
 
     Processes the statements between !IFNDEF and the next !ELSE or
     !ENDIF if <macroname> is not defined.
 
     Syntax:  !ENDIF
 
     Marks the end of an !IF, !IFDEF, or !IFNDEF block. Anything
     following !ENDIF on the same line is ignored.
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