Library /sys$common/syshlp/helplib.hlb  —  CRTL  cuserid  Argument
 str

    If this argument is NULL, the user name is stored internally. If
    the argument is not NULL, it points to a storage area of length
    L_cuserid (defined by the <stdio.h> header file), and the name is
    written into that storage. If the user name is a null string, the
    function returns NULL.
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