Virtual Pass-through

We are having difficulty trying to use Client Access (V3R1M2 w/ 
SF39669) to "virtually pass-through" to other 400s in our network. 
The PCs are using CAT5 twisted pair, w/ a direct connection (no 
5x94).

Is there an OS/400 version limitation for virtual pass-through? I 
suspect this because we can successfully use virtual pass-through 
between an F70 at V3R1 and a 530 at V3R7. When we try to connect to a 
pre-V3R1 box (one is V2R3 and the other is V3R0M5?) we get a "license 
system xxxxxxx not available" error from CA.

Also, can CA virtually pass-through to an AS/400 that doesn't have 
the 5763XD1 (Client Access) product at all? In other words, CA is on 
the PC, but not on the 400 that we want to virtually pass-through to.

Thanks
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