Library /sys$common/syshlp/helplib.hlb  —  CRTL  tmpnam  Return Value
    x                  If the name argument is the NULL pointer
                       value NULL, tmpnam returns the address of
                       an internal storage area. If name is not NULL,
                       then it is considered the address of an area
                       of length L_tmpnam (defined in the <stdio.h>
                       header file). In this case, tmpnam returns the
                       name argument as the result.
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