Crashes OZ while in a popdown and an error handler is installed in segment 2, when the popdown is pre-empted (with RC_QUIT) during the GN_Sip call.
GN_Gmt, get (read) machine time in internal format
GN_Gtm, convert an ASCII string to a time in internal format
GN_Msc, miscellaneous time operations
GN_Pmt, put (set) machine time
GN_Ptm, write internal time as ASCII string
OS_Dly, delay a given period