[FX.php List] sort parameters in URL strings

[biscuit technologies]

Hello,
Can anyone tell me if it's possible to create URL strings with various sort
parameters and if so, how to format them?

I have a simple page displaying four fields of related data:
Vendor, product, start term, end term

On load I sort by vendor. What I'd like to do is have a link at the column
header to sort by Product and have that sort actually be sort by Product,
Vendor and I'm trying to do it without going to a different page. I've tried
different URL strings to replace currentSort but haven't had any luck.

Thanks for any help,
David
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