\@sms_XXX where XXX is the variable passed through the link.
For instance if the variable passed through the link it's called gender: &gender=1 then \@sms_gender will return the value 1
\@sms_XXX where XXX is the variable passed through the link.
For instance if the variable passed through the link it's called gender: &gender=1 then \@sms_gender will return the value 1