OK, I have a 99% solution for the problem.

After comparing the lsmods as Jim suggested, I discovered that neither Knoppix 
nor Fedora load usbmouse when there are USB mice present (as LTSP does), so I 
went to the client�s shell and typed:
>rmmod usbmouse
The response was:
>usb.c: Deregistering driver usbmouse
>input: USB HID v1.00 Mouse [0d3d:0001] on usb1:3.1
This was encouraging, so I switched to the GUI and the PS/2 mouse was working 
properly via the USB<>PS/2 converter - Success!

I then tried playing with the startup scripts (usb.rc in particular), but 
nothing seemed to have a positive effect. I ended up creating a script in rc.d 
to remove the offending driver, then added "RCFILE_01 = noUSBmouse" to 
lts.conf. This works well.

My guess is that LTSP needs usbmouse to perform some initialization 
function(s), but that it later gets in the way and must be removed. usbmouse 
does not even seem to be required for USB mice, as when I plug a USB mouse in 
after the system starts up it is immediately recognized and works (in 
*addition* to the mouse connected via the USB<>PS/2 converter!). This parallels 
my experience with Fedora and Knoppix.

I say this is a 99% solution because the script seems to be called twice - 
despite there only being one place in the initialization sequence where the 
script might be called. This does not seem to have any ill effects, so it�s 
more of a curious annoyance than anything else.

Side note: Neither Fedora nor Knoppix load usbkbd either, but rmmod�ing this 
module seems to occasionally cause odd behavior. It seems better to leave this 
one alone...

==============

I cannot report that this is a comprehensive solution or that it will work on 
all USB<>PS/2 converters, so my experience should be considered anecdotal.
My particular converter is an Omega Technologies #UAPS13.

==============

Thanks to Jim for illuminating the path that ultimately led to the solution.
And Jim, I hope that you read this before you get to the "War and Peace" email 
I sent yesterday evening - or at least before you respond to it...

GKP
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