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That is, DOS 5.0 can either link or unlink UMBs from the standard memory chain (in conventional memory). To allocate memory from UMBs, a program must both set an allocation strategy which looks at UMBs and link the UMBs to the pool of available memory.
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The owner of a memory block is a 16-bit word. It is set to zero to indicate a free block. A non-zero value is normally the PID (process identifier) of the owner, that is, the address of the PSP of the owning process. This is important when a process terminates, because DOS automatically frees all memory blocks that the process owned. Note that DOS performs no validity checks on the owner; any process can free or resize any block, regardless of who owns it, and the MCB owner need not be a valid PID.
Трамп высказался о непростом решении по Ирану09:14
这种化繁为简的能力，就是每年的新硬件最令人着迷的地方。