mov ax, 1400h ;Get NLSFUNC.EXE Installed State
int 2Fh ;Multiplex Interrupt
cmp al, 0FFh ;0FFh means installed
Get NLSFUNC.EXE Installed State (Interrupt 2Fh Function 1400h) determines whether the resident portion of the Nlsfunc program is loaded.
This function has no parameters.
The AL register contains 0FFh if the Nlsfunc program has been loaded or 00h if it has not.