There isn't currently easy solution because viewer (both APS Viewer and Tandem Viewer) are polluting global namespace. There can be some options:

• set USE_LMV_APP_NAMESPACES to true and define own namespace using LMV_APP_NAMESPACE, for example:

<script>
  window.USE_LMV_APP_NAMESPACES = true;
  window.LMV_APP_NAMESPACE = 'myApp';
</script>

This should be set before loading first viewer script. Note this option wasn't thoroughly tested and may have some limitations.

• Could you possibly use separate window for each viewer?