INT 2F - NLSFUNC.COM - INSTALLATION CHECK
AX = 1400h
Return: AL = 00h not installed, OK to install
01h not installed, not OK
FFh installed
Notes:  called by DOS v3.3+ kernel
supported by OS/2 v1.3+ compatibility box, which always returns AL=FFh
supported by DR-DOS 5.0
documented for MS-DOS 5.0, but undocumented in prior versions
SeeAlso: AX=1402h"NLSFUNC"

See also: 2F1401

2F1400 - NLSFUNC.COM - INSTALLATION CHECK