Execute a root application from standard user session

I have to build a ISA driver under QNX Neutrino. I think ISA bus is not mapped like for example the serial port. So I have to write/read directly in ports.
The problem is in some functions (that only can be executed under root privileges).
Is there any way to execute this “root functions” under a standard session?
Is there any way to change the exec mode?

Thanks very much

ThreadCtl(_NTO_TCTL_IO,0) with the process having root capabilities

Once that done you can chmod +s the file.