Hello all,
Just for future reference, here's the longest chain of options after the "gvm" command that I've gotten to work (in a script):

/usr/bin/gvm is where the "gvm" command is located

-a IMGE launches Resco Explorer

-O sets rotation

-f sets fullscreen

-i D050 is the Device ID for a Palm TX

-n XXXX... sets the serial number. I found mine using the information tab in Filez (I suspect it might affect the device number that Mobipocket generates, but I haven't tried it yet). In Filez, my serial number came with an "-N" at the end. For the gvm command, just leave the "-N" off.

-u "Xxx Xxx:1107" sets the Hotsync ID. The four-digit number after the Hotsync ID is optional, as far as I understand. I found "1107" within one of the files that is similar to where the Hotsync ID is stored (sorry, I forgot where, but you can look around with Resco Explorer)

-z 1.5 sets the magnication

-L 0x0000,0x0000,0x0000 sets the background to black [Thanks, dfinch!]

-g gvm.store_1 launches from a specified gvm.store file located within /home/user/.gvm [Thanks, burmashave!] so you can have multiple Palm VM's

Now, to find out if I can launch the gvm-launcher program with a Hotsync ID option!