The official answer to the original question is "no, you can't connect two desktop Macs via SCSI". This is because both Macs have their internal hard drives set to SCSI ID 0 and their SCSI controllers set to ID 7, hence there will be ID conflicts.

However, it is possible and I used to routinely connect Macs together when upgrading customers to new machines. It was much easier to carry a single SCSI cable and a SCSI ID jumper than an external hard drive case + SCSI cable + power cord when on site.

The work around goes like this:

- open the Mac that is to act as an external hard drive. Jumper the SCSI ID to 1 (or whatever, just not 0 or 7). On many Macs (especially LCs), this can be done by just unclipping the drive and swinging it up to access the ID pins - no need to unscrew anything, or even unplug the cables.

- connect the two computers using a 25 way to 25 way SCSI cable.

- Power on the "external hard drive" Mac and press the programmer's interrupt button during the RAM test (the gray checkerboard screen before the Mac "smiles")

- This Mac then "crashes" prior to its SCSI controller being initialised on SCSI ID 7 and is to all intents and purposes an external SCSI disk.

- Boot the other Mac and tranfer data across.