Then in the OnOpen event of the form, read the argument string and be as simple/sophisticated as needed to interpret the arguments, for example;
Set tvs = New clsTaggedValues
tvs.Text = Me.OpenArgs
I know it is not very elegant, but if you don't mind opening the new form as modal, you can set a global variable and have the new form use that variable in the OnOpen event (which we did all the time before Microsoft added the Open Args parameter).
I don't know if this is useful, as I am using an ADP, but I use stored procedures as the recordsources for my forms so I just set the input parameters on the subforms record source to controls on the parent form, and Access handles a lot of the rest.