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- set varname ?value?
- Returns the value of variable varname. If value is
- specified, then set the value of varname to value,
- creating a new variable if one doesn't already exist,
- and return its value. If varName contains an open
- parenthesis and ends with a close parenthesis, then it
- refers to an array element: the characters before the
- open parenthesis are the name of the array, and the
- characters between the parentheses are the index within
- the array. Otherwise varName refers to a scalar
- variable. If no procedure is active, then varname
- refers to a global variable. If a procedure is active,
- then varname refers to a parameter or local variable of
- the procedure, unless the global command has been
- invoked to declare varname to be global.
-