Parameter

label

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

   The label can precede or follow the GOSUB statement in the
   current command procedure. 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.