Confused about 64-bit programs


hello , apologize in advance. i'm sorry searched around , still unsure.

in older thread here saw in order take advantage of 64bit programs need restart snow leopard in 64-bit holding down 6 +4 while rebooting (or changing preference somewhere). remember doing awhile made esata card not work (even though it's best 1 available 17"umbp summer 09', sonnet tempo pro).

cs5 out , excited ps , ae being 64-bit, has changed or still have reboot described above in order take advantage of ability.

unless i'm off here imagine many of excited 64-bit didn't realize had that. can please explain me? also, still have hold 6 + 4 @ bootup?
 

you never had restart holding 6 , 4 take advantage of 64-bit in snow leopard, that's how boot 64-bit kernel (unnecessary).
 


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