Compatibility: 3.0+
Expects: AX    1400H
                                                                  
Returns: AL    status: 00H = is not installed
ffH = is installed
                                                                  
Info: Checks to see if NLSFUNC.EXE (National Language Support provider)
has been executed and is resident in memory.

- -

INT 2fH 1400H: Is Nlsfunc.Exe Installed?