Perhaps this post might work for you?
https://mapguide.wordpress.com/2013/06/11/autodesk-infrastructure-map-server-auto-zoom-on-load/
I pass the query such as:
http://localhost/mapguide/fusion/templates/mapguide/slate/index.html
?LAYERNAME=Roads
KEYNAME=ID
KEY=644,684
ISSTRING=1
Where you can pass a comma delimited list of keys to the INDEX.html page and
automatically zoom and select the features
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