A method of accessing data in a multiprocessor system, said system comprising a plurality of processor modules each comprising a plurality of processors , each processor being associated with a respective cache memory, and a cache memory management module , said system comprising a central memory module , being in the form of a common virtual space between the processor modules , said central memory module comprising a central memory and a central memory management module , the method comprising the following steps of: • receiving by said cache memory management module, an initial request relative to access to data by a processor, • first sending , by said cache memory management module, of at least a first request to at least one cache memory concerning said data, • second sending , in parallel with the first sending, by said cache memory management module, of at least a second request to said central memory management module concerning said data, • verifying , by said central memory management module, whether or not to initiate the querying of said central memory, and • querying or not, by said central memory management module, said central memory depending on said verification • wherein a cache memory management by directory is implemented within said system and wherein said verification by said central memory management module comprises the consultation of a status directory of the data in cache memory, • wherein said central memory management module comprises a directory which for each data stored in said central memory provides it with information about the status of that data and about a list of protocol agents able to send requests for access to data in central memory which have a copy thereof in their respective cache memories, and • wherein said querying is carried out if the information from the directory makes it possible to determine that said data is not present in cache memory or in a status compatible with said initial request. • receiving by said cache memory management module, an initial request relative to access to data by a processor, • first sending , by said cache memory management module, of at least a first request to at least one cache memory concerning said data, • second sending , in parallel with the first sending, by said cache memory management module, of at least a second request to said central memory management module concerning said data, • verifying , by said central memory management module, whether or not to initiate the querying of said central memory, and • querying or not, by said central memory management module, said central memory depending on said verification • wherein a cache memory management by directory is implemented within said system and wherein said verification by said central memory management module comprises the consultation of a status directory of the data in cache memory, • wherein said central memory management module comprises a directory which for each data stored in said central memory provides it with information about the status of that data and about a list of protocol agents able to send requests for access to data in central memory which have a copy thereof in their respective cache memories, and • wherein said querying is carried out if the information from the directory makes it possible to determine that said data is not present in cache memory or in a status compatible with said initial request. <EOS>