You can run multiple instances of PicoLog recorder software, one per device, as shown here http://www.picotech.com/support/kb/DataLoggers-kb188
You can run multiple devices in one instance of PicoLog, up to 20 TC08's for example, for large data acquisition systems.
You can't run two instances of our software connected to one single device, the driver is not designed to allow this. If you need to split data, as per the previous posters request from 2012, you would need to write custom software using the SDK.
Do you have a particular requirement in mind ?