System中记录体函数命名怪异

//1019unit System; 中发现记录体函数命名怪异
//乍一看，很怪异，其实是结构体里面 的变量后面直接写 函数类型了。不像传统先定义
T***Event      = procedure(Sender: TObject;LbName : string)of object;
再使用  VarClear ：= T***Event;

PVariantManager = ^TVariantManager;
  TVariantManager = record
    VarClear: procedure(var V : Variant); 
    VarCopy: procedure(var Dest: Variant; const Source: Variant);
    VarCopyNoInd: procedure; // ARGS PLEASE!
    VarCast: procedure(var Dest: Variant; const Source: Variant; VarType: Integer);
    VarCastOle: procedure(var Dest: Variant; const Source: Variant; VarType: Integer);

    VarToInt: function(const V: Variant): Integer;
    VarToInt64: function(const V: Variant): Int64;
    VarToBool: function(const V: Variant): Boolean;
    VarToReal: function(const V: Variant): Extended;
    VarToCurr: function(const V: Variant): Currency;
    VarToPStr: procedure(var S; const V: Variant);
    VarToLStr: procedure(var S: string; const V: Variant);
    VarToWStr: procedure(var S: WideString; const V: Variant);
    VarToIntf: procedure(var Unknown: IInterface; const V: Variant);
    VarToDisp: procedure(var Dispatch: IDispatch; const V: Variant);
    VarToDynArray: procedure(var DynArray: Pointer; const V: Variant; TypeInfo: Pointer);

    VarFromInt: procedure(var V: Variant; const Value: Integer; const Range: ShortInt);
    VarFromInt64: procedure(var V: Variant; const Value: Int64);
    VarFromBool: procedure(var V: Variant; const Value: Boolean);
    VarFromReal: procedure; // var V: Variant; const Value: Real
    VarFromTDateTime: procedure; // var V: Variant; const Value: TDateTime
    VarFromCurr: procedure; // var V: Variant; const Value: Currency
    VarFromPStr: procedure(var V: Variant; const Value: ShortString);
    VarFromLStr: procedure(var V: Variant; const Value: string);
    VarFromWStr: procedure(var V: Variant; const Value: WideString);
    VarFromIntf: procedure(var V: Variant; const Value: IInterface);
    VarFromDisp: procedure(var V: Variant; const Value: IDispatch);
    VarFromDynArray: procedure(var V: Variant; const DynArray: Pointer; TypeInfo: Pointer);
    OleVarFromPStr: procedure(var V: OleVariant; const Value: ShortString);
    OleVarFromLStr: procedure(var V: OleVariant; const Value: string);
    OleVarFromVar: procedure(var V: OleVariant; const Value: Variant);
    OleVarFromInt: procedure(var V: OleVariant; const Value: Integer; const Range: ShortInt);
    OleVarFromInt64: procedure(var V: OleVariant; const Value: Int64);

    VarOp: procedure(var Left: Variant; const Right: Variant; OpCode: TVarOp);
    VarCmp: procedure(const Left, Right: TVarData; const OpCode: TVarOp); { result is set in the flags }
    VarNeg: procedure(var V: Variant);
    VarNot: procedure(var V: Variant);

    DispInvoke: procedure(Dest: PVarData; const Source: TVarData;
      CallDesc: PCallDesc; Params: Pointer); cdecl;
    VarAddRef: procedure(var V: Variant);

    VarArrayRedim: procedure(var A : Variant; HighBound: Integer);
    VarArrayGet: function(var A: Variant; IndexCount: Integer;
      Indices: Integer): Variant; cdecl;
    VarArrayPut: procedure(var A: Variant; const Value: Variant;
      IndexCount: Integer; Indices: Integer); cdecl;

    WriteVariant: function(var T: Text; const V: Variant; Width: Integer): Pointer;
    Write0Variant: function(var T: Text; const V: Variant): Pointer;
  end deprecated;
  //--------
    PUnwinder = ^TUnwinder;
  TUnwinder = record
    RaiseException: function(Exc: Pointer): LongBool; cdecl;
    RegisterIPLookup: function(fn: Pointer; StartAddr, EndAddr: LongInt; Context: Pointer; GOT: LongInt): LongBool; cdecl;
    UnregisterIPLookup: procedure(StartAddr: LongInt) cdecl;
    DelphiLookup: function(Addr: LongInt; Context: Pointer): Pointer; cdecl;
    ClosestHandler: function(Context: Pointer): LongWord; cdecl;
  end;
  
  //----------
  {$IFDEF DEBUG}
{
  This variable is just for debugging the exception handling system.  See
  _DbgExcNotify for the usage.
}
var
  ExcNotificationProc : procedure(NotificationKind: Integer;
                                  ExceptionObject: Pointer;
                                  ExceptionName: PShortString;
                                  ExceptionLocation: Pointer;
                                  HandlerAddr: Pointer) = nil; //还可以赋值为nil
{$ENDIF DEBUG}

TVariantManager怎么使作啊
这个类型怎么使用，给个例子

------解决方案--------------------
这个类用户通常不直接使用,当你使用Variant变量的时候,编译器就会根据这个类来调用相应的处理