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- set varname [value]
- If value isn't specified, then return the current value
- of varname. If value is specified, then set the value
- of varname to value, creating a new variable if one
- doesn't already exist. 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.
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