There are several ways of passing variables from one page to
the next. These generally are known as scoped variables. Scopes
that address this issue are FORM, URL, SESSION, CLIENT and
APPLICATION.
You have supplied a URL that contains URL scope variables.
These can be found after the "?" in the URL, and have the format
variableName=variableValue. So you have these variables:
CategoryId, PageID, kw and LinkType. The page that is called often
takes these variables and their values and performs a database
query. In your specific case, the database is being queried for
Jackets.
FORM variables (<INPUT> tag) produce form fields that
are one of two types: TYPE="text" and TYPE="hidden". The are coded
on the page where your form is laid out. TYPE="text" displays a
text box into which the user can enter data. TYPE="hidden" does not
display a text box. Both of these pass the name and value of the
form field.
A discussion about ColdFusion variables and the advantages of
each of these variable scopes can be found at
http://livedocs.adobe.com/coldfusion/8/htmldocs/help.html?content=Variables_01.html#1144176
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