Autodesk MapGuide Viewer can select all map features that are within selected polygon map features. The polygons should be on their own layer in order for this command to work effectively.
For example, if you selected a buffer feature in step 1 that represents a specific distance from a customer's location, and you want to find all Acme Widget resellers within that specified distance from the customer's location, you would select the layer that contains the reseller locations.
All map features from the specified layer that fall within the previously selected polygon(s) are now selected.