Immigration Site

How can I find out if a program is "means tested public assiatance".
For example the Rent Assistance Vouchers for low income families.
Are they "means tested" as defined in the Affidavit of Support form I-134?
I ask, because that form only talks about 1) Food Stamp, 2) Sup Income, and 3) Assitance for Needy Families.
What about other programs WIC, Childrens medicaid, First Time Home buyers Assiatance, etc.

Thanks.