How can I launch SimPlay with a predefined target ?

Add to SimPlay base URL http://cdsweb.u-strasbg.fr/SimPlay/ the fragment #target= followed by the target (object name or position) you wish to query.
Do not forget to correctly encode the target value.

Example: The URL http://cdsweb.u-strasbg.fr/SimPlay/#target=crab+nebula will launch SimPlay centered around the Crab Nebula.