rename <username> requests the server to give you the specified name.
spawn text <URL> spawns a text object pulling the text from the given URL.
spawn image <URL> spawns an image object pulling the image from the given URL.
spawn video <URL> spawns a video object pulling the video/audio from the given URL.
spawn audio <URL> spawns a resized video object pulling the video/audio from the given URL.
spawn file <URL> (where 'file' can be replaced with 'link') spawns a file/link object naming the given URL.
spawn chat spawns a chat object.
<username>#<objectnumber> (e.g. user1#1) refers to an object.
#<objectnumber> (e.g. #1) refers to your own objects.
This notation is to be used when an object is requested as a parameter.
The following commands spawn objects pulling their content using source information of the given object.
totext <object> spawns a text object from the given object.
toimage <object> spawns an image object from the given object.
tovideo <object> spawns a video object from the given object.
toaudio <object> spawns an audio object from the given object.
tofile <object> (equally 'tolink') spawns a file/link object from the given object. This translates to reextracting the source URLs of the given object.
setlocalsource <object> <URL> changes your locally used source URL for the given object. This enables more efficient or distributed media sharing, but can lead to confusion when misused.
isolate simply put, it prevents further users from joining the room. Technically it disconnects the room from the entrance system, leaving an empty room on the used Room ID and the current room as a 'ghost room' that cannot be addressed, thus not joined. On connection loss, reconnection will lead to the new empty room.