I've got a few questions about Linux applications and duel booting two hard-disks...

(1)How come no matter how many times I install an application, it doesn't show up in xfce4 menu ? I can't seem to locate it and I forgot the terminal command to locate it...
(2) Okay so my Dad found his old external hard-drive and gave me the hard-disk with free-BSD on it. I'm planning on shutting down the computer and connecting the second hard-disk a little while into the night, and what I was wondering if how do I set up the boot manager GRUB to dual boot the two hard-disk before shutting down this computer and connecting the other hard-disk ? Can I change something in the script for GRUB or is anything else I could do ?  

What I'm wanting to do is configure the GRUB into letting me choose between the two hard-disk when I add the second hard-disk. But I don't want it to give an error or automaticly boot into my Debian box.

Any help on either question would be okay, but I'm more comfortable in asking AFF before I go on some IRC chat-room and possibly get sneered at.

P.S: On the first question about the missing application, I keep installing Terminator X a music manipulation program with Synaptic, but it doesn't show up in the menu at all. Is there something going wrong with the installation ? I'm going to check the install log to see if I could figure it out.  

Thank you

Never mind, The hard-disk had to be on another type of SCSI ribbon on another socket and I couldn't get the computer to recognize the 30Gb hard-disk. I even tried moving the jumper from CS (secondary slave) SLV then to MST and the computer still didn't recognize the hard-disk.  

Also I might had damaged the pins on the 30Gb trying to force the main SCSI ribbon unto the new hard-disk. It wasn't till I took it out and really look at it that I realized I was trying to connect the wrong ribbon end to it...

Sorry for wasting anyone's time with my computer ineptness. Right now I feel like a complete failure

http://wiki.xfce.org/howto/customize-menu

It's probably easier just to change the boot order in your BIOS, but failing that, here's the grub commands
root (hdX,Y)
chainloader +1
boot
where (hdX,Y) is the relevant partition to boot from

What I'm wanting to do is configure the GRUB into letting me choose between the two hard-disk when I add the second hard-disk. But I don't want it to give an error or automaticly boot into my Debian box.

Any help on either question would be okay, but I'm more comfortable in asking AFF before I go on some IRC chat-room and possibly get sneered at.

P.S: On the first question about the missing application, I keep installing Terminator X a music manipulation program with Synaptic, but it doesn't show up in the menu at all. Is there something going wrong with the installation ? I'm going to check the install log to see if I could figure it out.  

Thank you

Thank you Gareth, I appreciate it but I'm afraid that my desktop is dying a very slow death and everyday it's dies a little more. I've decided to go dumpster diving for a new desktop (anything) rather new or old since Linux can run on anything....