Generate Guest pass with 1 0 o and i . It is possible?

[gerard_poch]

It's posible to create pass with o i ? using all the alphabet on keyboard? 

[michael_brado]

You may use any valid ASCII character(s), from 1 to 16 of them.

Stay with Alpha and Numeric combinations for best client compatibility.

[cassy_davis_745]

I think yes, why not. And I also suggest to use both letters and numbers.
Cassy,
essaytrust

[gerard_poch]

So why happen this?