Library /sys$common/syshlp/helplib.hlb  —  CRTL  brk  Description
    An address that is greater than or equal to the break address
    and less than the stack pointer is considered to be outside the
    program's address space. Attempts to reference it will cause
    access violations.

    When a program is executed, the break address is set to the
    highest location defined by the program and data storage areas.
    Consequently, brk is needed only by programs that have growing
    data areas.
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