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  VARIABLES

  A variable is a location in memory where something is stored. The
  contents of a variable can be changed by program code (hence the
  name). In SALT, there are two types of variables, integer variables,
  and string variables. The former holds an integer value (e.g.,
  485624, or -627), while the latter holds a text string (e.g.
  "Telix", or "SCRIPT"). Depending on where it is defined, a variable
  is either global or local. If a variable is global, it means that it
  can be used by any part of the script after the point where it is
  defined. If a variable is local, it means that it can only be used
  by the part of the script to which it is 'local', for example, the
  function inside which it is defined. A variable name can be up to 31
  characters long, and may include the letters 'A' to 'Z' or 'a' to 'z',
  the digits '0' to '9', or the underscore character (_). The name may
  not start with a digit. For example, 'his_name2' and '_his_name2'
  are legal as variable names, while '2his_name' is not.

  If a variable is defined outside of a function, it is global. If it is
  defined inside a function, it is local to that function and will only
  be recognized there. If a variable defined inside a function uses
  the same name as a global variable, any reference to that name while
  in the function will access the local variable. After the function
  has completed, the local variable is removed and a reference to that
  name will access the global variable.