The following set of functions is used to read/write single values through port. Their assignment is evident from names and requires no comments.
GetPortByte - read a byte from a port
GetPortWord - read a word from a port
GetPortLong - read a double word from a port
SetPortByte - write a byte to a port
SetPortWord - write a word to a port
SetPortLong - write a double word to a port