INT 2F C - NLSFUNC.COM - INSTALLATION CHECK AX = 1400h BX <> 0EDCh Return: AL = status 00h not installed, OK to install 01h not installed, not OK to install FFh installed Notes: this function is called by the DOS v3.3+ kernel supported by OS/2 v1.3+ compatibility box, which always returns AL=FFh supported by DR DOS 5.0+ NLSFUNC v3.0+ documented for MS-DOS 5+, but undocumentedInformation about a product which is not publicly available from the manufacturer, and must be determined by reverse-engineering (disassembly, trial-and-error, etc.). Undocumented information tends to change -- often dramatically -- between successive revisions of a product, since the manufacturer has no obligation to maintain compatibility in behavior which is not explicitly stated. in prior versions DR DOS 5.0+ NLSFUNC 3.00+ returns CF set and AX=0001h, if AL was not 00h, FEh, or FFh on entry. SeeAlso: AX=1400h/BX=0EDCh,AX=1401h"NLSFUNC",AX=1402h"NLSFUNC"