Some supplies may be paralleled and it's usually stated in the datasheet. Such a thing has to have special connections for current sharing. Most likely at higher power levels, like 2 kW up. This particular one most likely could not work properly even using dedicated sense connections. You may always try passive sharing using series ballast resistors (defeating the very idea of good regulated PSU) at your own risk.
Don't even think about it. In general PSU's cannot be paralleled unless specifically designed for it and described in the datasheet. Bad things happen if you try. Any passive sharing requires diodes, not just resistors, and you might encounter catestrophic instability as the two voltage control loops interact. I've accidentally seen this happen with lowly 5V 1A linear regulators, blew every 5V chip on the board...
