BootX is a boot manager that is used by "OldWorld" Macs (those that used hardware ROMs instead of Open Firmware) to allow the Mac to boot into another operating system (like Linux/ppc). Here's more information about it.
As for emptying it, have you tried holding down Option while emptying the trash? This worked in Mac OS 9 and below for force emptying the trash. I think it still holds for OS X.
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• Apple iMac G5 17" (2 GHz G5) - Mac OS X 10.4.11
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