Can I send a TTL pulse to multiple PowerLabs from the SuperLab software?

It is possible to send a split TTL pulse from SuperLab to multiple devices that are compatible with the StimTracker hardware interface using two parallel port splitters
However, if too many devices are connected, clock skew may be an issue as the TTL signal begins to draw current from the device. 
Note: ADInstruments does not sell parallel port splitters.