"open" command ?

Hey All,

I'm currently trying to install a rather exotic piece of software to run 
redemption/loyalty cards called ARI.

I seem to falling at the last step, probably due to my unfamiliarity with 
RedHat ES 4's little quirks.

The startup script for the server side contains the following:

#!/bin/sh
open -c 8 -- /ari/code/bin/myebank

but the system bombs out with:
./startmyebank: line 2: open: command not found

I'v played with bash scripting for a few years but I'm not familiar with the 
"open" command outside of Perl File I/O...

Anyone know what blasted RedHat RPM I have to up2date to make this script 
happy ?

-Michael Carmody