Is there a command that shows all of the installed hardware devices or all of the device drivers that are loaded.?

You can try lsmod

I think that's what I needed, not sure...

[root@localhost /]# lsmod
Module Size Used by Not tainted
udf 90464 0 (autoclean)
ppp_deflate 4408 2 (autoclean)
zlib_inflate 21156 0 (autoclean) [ppp_deflate]
zlib_deflate 21144 0 (autoclean) [ppp_deflate]
bsd_comp 5336 0 (autoclean)
binfmt_misc 7020 1
lp 8096 1
parport_pc 25096 1
parport 34176 1 [lp parport_pc]
agpgart 40896 6 (autoclean)
i810_audio 26248 1
soundcore 6276 0 [i810_audio]
ac97_codec 12488 0 [i810_audio]
nfsd 74256 0 (autoclean)
ppp_async 9216 1
ppp_generic 24060 3 [ppp_deflate bsd_comp ppp_async]
slhc 6564 1 [ppp_generic]
af_packet 14952 0 (autoclean)
sr_mod 16920 0 (autoclean)
floppy 55132 0
bcm4400 30432 1 (autoclean)
nls_iso8859-1 3516 3 (autoclean)
ntfs 76812 3 (autoclean)
supermount 15296 2 (autoclean)
ide-cd 33856 0
cdrom 31648 0 [sr_mod ide-cd]
ide-scsi 11280 0
usb-storage 72952 0 (unused)
scsi_mod 103284 2 [sr_mod ide-scsi usb-storage]
scanner 10904 0
printer 8448 0
ehci-hcd 18568 0 (unused)
usb-uhci 24652 0 (unused)
usbcore 72992 1 [usb-storage scanner printer ehci-hcd usb-uhci]
rtc 8060 0 (autoclean)
ext3 59916 3
jbd 38972 3 [ext3]

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