Pentax *ist IST DS - Manual (Page 160)

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To use two or more external flashes simultaneously, either use the same
type of flashes as shown in the flash function chart on p.153 or use the
combination of AF360FGZ/AF500FTZ/AF330FTZ and AF400FTZ/
AF240FT. The built-in flash can be combined with any type. Connect them
as shown in the figure below: Attach an off-camera shoe adapter F
(optional) to the external flash and the hot shoe adapter F (optional) and
connect the extension cord F5P (optional) to the off-camera shoe adapter
F on the other external flash.
When combining two or more external flashes
Discharging Multiple Flashes
• Do not combine with accessories that have a different number of contacts
such as a Hot Shoe Grip. A malfunction may occur.
• Combining with flashes from other manufacturers may cause equipment
breakdown. We recommend using the PENTAX dedicated automatic
flashes.
• The AF500FTZ can be connected directly to the Extension cord F5P without
the off-camera shoe adapter F.
• When using multiple AF360FGZ units or an AF360FGZ unit with the built-in
flash, P-TTL is used for flash control. Other flash combinations use TTL.