[X-Unix] Backdoor method to add users

[Alex]

On Saturday, Feb 21, 2004, at 13:49 Canada/Eastern, William H. Magill 
wrote:

> [...] The "UID" [...] is a numeric value whose maximum value is 
> determined by both the number of bits the hardware architecture 
> supports (as in 8/16/32/64) and by the coding of the kernel to support 
> a particular "address" space. [...] if OS X is 64 bit clean, it 
> supports a 64 bit number, [...]

I was under the impression that, even on some 32-bit and 64-bit 
systems, the UID is limited to 65535 (biggest 16-bit unsigned integer). 
I don't recall where I read this -- is it incorrect?

f