another datagridview ?

I have a DATAGRIDVIEW that is populated from a dataset.datatable = everything is fine to this point
1 of the cells is a checkbox and not bound to anything
I give customers a chance to check whatever boxes the want on the datagridview
when the datagridview is presented and various boxes checked
i want to program a public function to massage some data and run some chunks of code

PROBLEM

I'm not sure how to get the current data from the datagridview and bring that data checkboxes and all over to the public function
in a standard module - I think it has something to do with the .DATASOURCE property but I don't know how the reference the current
data - I have the grid over there but NO data??