RS>   ALIAS                LIBRARY              PRELOAD
 RS>   BASE                 LOADONCALL         * PRIVATE
 RS>   CODE               * LONGNAMES          * PROTECT
 [...]

Some of these are from OS/2 1.x,  and are now ignored if you specify them. 
Some of them are for Windows,  and some (I will guess) are for PowerPC. 
Some are intel features that are ignored.  Some are keywords that were
undocumented at one time (for example DOS4,  which was what MS called OS/2
before it had a name) that were never used in the real world.  IBM's philo
is "once a reserved word,  always a reserved word".

For a good read, check out \toolkit\h\exe386.h, and newexe.h.

--- Maximus/2 3.00