Oops. Where I wrote >It is not present in 4.2 or 4.1, and probably was not in 4.1 (though I meant `in 4.2 or 4.3'. Sorry about that. -- In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 1415) UUCP: seismo!umcp-cs!chris CSNet: chris at umcp-cs ARPA: chris at mimsy.umd.edu