Basics
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  $A Determines whether data is aligned or packed
  $Align Determines whether data is aligned or packed
  $AppType Determines the application type : GUI or Console
  $B Whether to short cut and and or operations
  $BoolEval Whether to short cut and and or operations
  $D Determines whether application debug information is built
  $DebugInfo Determines whether application debug information is built
  $Define Defines a compiler directive symbol - as used by IfDef
  $DefinitionInfo Determines whether application symbol information is built
  $Else Starts the alternate section of an IfDef or IfNDef
  $EndIf Terminates conditional code compilation
  $ExtendedSyntax Controls some Pascal extension handling
  $H Treat string types as AnsiString or ShortString
  $Hints Determines whether Delphi shows compilation hints
  $I Allows code in an include file to be incorporated into a Unit
  $IfDef Executes code if a conditional symbol has been defined
  $IfNDef Executes code if a conditional symbol has not been defined
  $IfOpt Tests for the state of a Compiler directive
  $Include Allows code in an include file to be incorporated into a Unit
  $IOChecks When on, an IO operation error throws an exception
  $L Determines what application debug information is built
  $LocalSymbols Determines what application debug information is built
  $LongStrings Treat string types as AnsiString or ShortString
  $MinEnumSize Sets the minimum storage used to hold enumerated types
  $O Determines whether Delphi optimises code when compiling
  $Optimization Determines whether Delphi optimises code when compiling
  $OverFlowChecks Determines whether Delphi checks integer and enum bounds
  $Q Determines whether Delphi checks integer and enum bounds
  $R Determines whether Delphi checks array bounds
  $RangeChecks Determines whether Delphi checks array bounds
  $ReferenceInfo Determines whether symbol reference information is built
  $Resource Defines a resource file to be included in the application linking
  $UnDef Undefines a compiler directive symbol - as used by IfDef
  $Warnings Determines whether Delphi shows compilation warnings
  $X Controls some Pascal extension handling
  $Y Determines whether application symbol information is built
  $Z Sets the minimum storage used to hold enumerated types
 
 
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