This command sets the item, object or NPC with the specified reference ID as your target. This is especially useful if you know the reference ID of your target but are unable to click on them (e.g. they are outside of your view or invisible).
pickrefbyid [reference id]
|Reference ID||The reference ID of the NPC/object/item you wish to select as your target.|
The above command would select the NPC with reference ID '0078783' as your target.
The PRID command is an alias of the PickRefById console command. The above command does the same as the first example.