An oil pressure control apparatus for an automatic transmission helps ensure sufficient oil pressure to be supplied to a friction engagement element for performing at least either a first shift stage or a reverse shift stage. Since an address and a data of a specific data memory are monitored to recognize a data flow and change of the specific address, an error that an erroneous calculation is inputted a during processing or a data memory is erroneously assigned is quickly sensed. The process also includes blending the treatment fluid with a treatment substance to produce a concentrated treatment fluid. The peripheral device receives data written to the set of virtual IDE device registers, and it transmits the data into a network, addressed for reception by the remote computer. The transaction service architecture gateway server operate to invoke distributed transaction services on a distribute transaction server upon receiving a request from a web service client.