How do I reference the parameter from the MS Access Macro

I would like to start access from command line, running a macro when the mdb starts, and pass a parameter to that macro, straight from the command line. Something like this:

"C:\Program Files\Microsoft Office\Office11\msaccess.exe" "c:\test.mdb" /x Macro_access_start "123"

The macro "Macro_access_start" would start a form that was based on query the parameter "well" to filter the data

Is this possible? How do I reference the parameter from the Macro?

Thanks!

Dallag