Query String Parameters

I've looked up all the Forum posts on Query String Parameters and I can't seem to find a direct answer to this question (lots of work-arounds thought).

In various web programming languages, there's a way to access incoming Query String Parameters.

For example, in PHP, if someone follows a URL like this http://www.example.com/page?myVar=xyz

You can reference $_REQUEST['myVar']

Is there a way to do this in Deluge?

Currently, I'm using a work around, I'm passing in a value via Query String like this ?Vendor_ID=somevalue
"somevalue" gets automatically input into my Forms input.Vendor_ID field. I can that use that value -> input.Vendor_ID to grab records from another form.

But you see how this is kind of cludgy? I can't use "somevalue" until it's been assigned to a field via some totally opaque process. Only after that can I use the value of input.Vendor_ID to perform some other kind of logic.

That means for every query string I need to pass in, I need to place a field in that form, whether I need that field in that form or not.

So, I am not looking for any more work-arounds. I'm pretty good at improvisation. I'd just like a direct answer regarding what tools do I have to work with.

Is there some method in Deluge to reference incoming Query String parameters directly, just like PHP's $_REQUEST['myVar'] or not?