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3. An example of the third party reserve function is applicable when using the COPY command.
For example, TARG/INIT #1 supports the COPY command, uses the COPY command and in
the case that a data transfer between TARG #0 and TARG/INIT#1 is executed, if the third
party reserve in 2) is executed before INIT #A issues a COPY command to TARG/INIT #1,
access to TARG #0 by INIT #B during execution of the COPY command can be prohibited.