Form user validation

[#1]

I am creating a form which will have more than two users to action and fill the details in. How can I validate whether the two users are different. Can i use some detail like userid of the person??? is their any variable that can be used at all??

[#2]

Hi

You can only access the userid by using a folder level script, this is something that needs to be installed on the users machines.  Is this an option?

Regards

Bruce

[#3]

Urgent help needed...please reply...any pointers that can help me resolve this are welcome~!