Assuming you have 2 completely independent forms, you can reference the forms by their names Forms!FirstForm and Forms!SecondForm. This can be done inside the other form or inside independent code. No need to use 'Me'. Me is used for the current item only. For example Me.Name is the name of the current Form. If the Query in the Second Form references a field in the first form, then a .Requery will work, but so fill changing the .Filter
Heres some code that may help...
DoCmd.OpenForm "FirstForm"
DoCmd.OpenForm "SecondForm"
Forms!SecondForm.Filter = "[DueDate] = #02/19/2001#"
Forms!SecondForm.FilterOn = True
G'Luck
7ony