The get tag is necessary to interact between Mathematica and page expressions. It gets a result from Mathematica and stores it in a page context attribute. Page context attributes can be used with other tag libraries and the expression language features of webMathematica pages. More information on this can be found in the section on Extended Page Language.
The get tag takes the following required attributes.
attribute that specifies the name of the page context attribute to hold the result
attribute that specifies the Mathematica command to be evaluated