You cannot use the K100D's built-in flash to trigger a slave flash. Well, you can, but you will have a problem: the flash fires twice, once when the mirror goes up and once when the actual shutter opens.
You can see this by putting the camera on the short timer setting (2s?) where it will flip the mirror up to prevent mirror slap from wobbling the camera while it is on a tripod. The flash will pop once when the mirror goes up, so the exposure sensor can figure out what exposure, and then a second time when the shutter opens.
This will end up triggering your external flash twice, which might result in it going off only once if it can't recycle fast enough.
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