Ref. Vol. 1?!? What version of GS/OS are you writing it for? If it's 5.04 and later, Ref. Vol. 3 makes lots of corrections and enhancments. You might try looking into Programmers Ref. for System 6 also. :) -- John M. =================================== INet: mills@max.ee.lsu.edu (pref) AOL: jmills (@aol.com) GEnie: J.MILLS11