type: system constant location: built-in source file: xlinit.c Common LISP compatible: yes supported on: all machines
The T constant is built into XLISP. It represents True - as oppossed to false (NIL).
(setq myvar T) ; set MYVAR to True (setq myvar 'T) ; T and 'T both evaluate to T (if t (print "this will print") ; if/then/else (print "this won't print"))
NOTE: Be careful with the T value. It is possible to do a SETQ on T and set it to other values (like NIL). Some operations will still return proper T or NIL values, but the system will be in a bad state.