June 3, 201015 yr This is a custom lasso tag which takes the name of HTTP-POST or GET parameter (submitted through form-posting for example) as argument and returns a Boolean value to indicate whether that parameter is found. It returns true if a parameter with that name is found in the set of HTTP POST/GET parameters and false if the parameter is not found. This Lasso custom tag is like isset() function in PHP. Hope this is useful .
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