Just a note that this functionality can SORT OF be accomodated in the existing system, however, it requires creating a separate form for each instance, and it would only be practical for very small projects.
Here's how -
Assuming you have a form that wants to Poll Men and Women differently:
1. Create two forms: Form 1 and Form 2 - Form 1 is "Men", Form 2 is "Women".
2. In each Form, create a Radio Button area (aka: Multiple Choice)
3. Make the default value of Form 1 to be "Men"
4. Make the default value of Form 2 to be "Women"
5. In the FORM PROPERTIES area for each form set the DESCRIPTION to be the Question that you would ask the user. i.e.: "If you are male, please click here" for Form 1, and "If you are Female, please click here" for form 2.
6. HIDE the properties of each field on both form 1 and 2 so that it is visible only to an administrator. This way, when a user sees the question, they will only see the Submit Button. Since you set the default value to "Men" on this field, it will redirect to the "Men" Form... and likewise for the "Woman" form. (Users will still see the submit button because it is not a component of the Hidden Field, but rather a component of the Form.
7. Set the value of Form 1 to redirect to a specific URL (or, in this case, another Machform) if it is selected -- let's say http://www.YourMachFormInstall.Com/view.php?id=1 which is the form for "Men"
8. Set the value of Form 2 to redirect to a specific URL (or, in this case, another Machform) if it is selected -- let's say http://www.YourMachFormInstall.Com/view.php?id=2 -- which is the form for "Women".
9. Copy the Embed Code / Integrated Form / IFRAME Code from Form 1 AND Form 2 into an HTML page.
10. Now you have a form that is, effectively TWO forms on one page. When someone clicks on the first form (by clicking Submit) they will be redirected to the URL that coincides with the "Men" form. When someone clicks on the second form (by clicking Submit) they will be redirected to the URL that coincides with the "Women" form.
Admittedly, it's not perfect, but it can be done if you're in a bind.
Anyways, it worked for me... :-)