/sys$common/syshlp/helplib.hlb GOTO, Parameter  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 label

    Specifies a label of 1 to 255 alphanumeric characters that
    appears as the first item on a command line. A label cannot
    contain embedded blanks. When the GOTO command is executed,
    control passes to the command following the specified label.

    When you use a label in a command procedure, it must be
    terminated with a colon (:).  If you use duplicate labels,
    control is always given to the label most recently read by DCL.