I know there's a way to do it in subsequent versions, but I'm dealing with 10.1. I need to make changes to definition queries to multiple layers (the field used in the query is the same throughout all layers). Is there a way to do it without having to go into each layer's properties? Thanks.
Was arcpy mapping module available then?
Because they can be changed in table properties
Alphabetical list of arcpy.mapping classes—Help | ArcGIS for Desktop
and there is a scripting example at the bottom of this link