Access: Call a Func from another Form with example

the main points are:
1 - make the func public (daa but we forget) and "As Variant"
2 - actualy find the damn form and how to call the func
when u have that u have it (double daa)
and for the example
call a func in a subform from the main form
the func:
Public Function Call_payment_date_AfterUpdate() As Variant
       payment_date_AfterUpdate
End Function
from the main form (in a func o/c)
Forms!ei_main_form![ei_purchase subsubform].Form.Call_payment_date_AfterUpdate

from a stand alone form call a func in another form
the func
Public Function Call_Refresh_From_ei_main() As Variant    Me.Refresh
End Function
the call
Forms!ei_main_form.Call_Refresh_From_ei_main

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