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Result:=(dir shl _IOC_DIRSHIFT) or (__type shl _IOC_TYPESHIFT) or
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(nr shl _IOC_NRSHIFT) or (size shl _IOC_SIZESHIFT);
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Function _IO(__type, nr: Cardinal): cardinal;
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Result := _IOC(_IOC_NONE,__type,nr,0);
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Function _IOR(_type,nr,size : cardinal) : cardinal;