pvm_getinst - returns the instance number in a group of a PVM process.
pvm_getinst takes a group name group and a PVM task identifier tid and returns the unique instance number that corresponds to the input. It can be called by any task whether in the group or not.
The returned value inumwill be >= 0 if the call is successful and will be will be < 0 if some error occurs.
inum = pvm_getinst( "worker", pvm_mytid() )