Fits stars in buffer im simultaneously using groups created by GROUP. Requires an input PSF file and an input GROUP file, which will be prompted for, or can be specified with the DAOFILES PSF=psffile GRP=grpfile command. The output file can be given with the DAOFILES PRO=outfile command, or it will be prompted for. The NCLIP= keyword allows the user to set the number of iterations required in NSTAR before pixels which do not seem to fit will have the weights reduced. The standard value of NCLIP in VISTA is 5. In Stetson's version of DAOPHOT, NCLIP effectively has the value of 1 (although this may depend on the exact version of DAOPHOT).