If the given system is a Hover I/O system, fetch a hover pointer.
Given data must be valid; the I/O must be a HoverIO instance and the number must be a valid pointer number.
I/O system to use.
Valid pointer number assigned by the I/O system.
Hover pointer under given number.
See Implementation
If the given system is a Hover I/O system, fetch a hover pointer.
Given data must be valid; the I/O must be a HoverIO instance and the number must be a valid pointer number.