>Ohh I meant assembler routines. ie: below asm code would get serial number of a given disk :

push bx
>mov ax, 6900
>mov dx,bx
>mov bx,[bx]
>int 21
>pop bx
>retf

And I would call this bin file (ie:serial.bin) from FPD like :

mp = chr(asc(upper(driveletter))-ASC("A")+1)+chr(0)+;
>	space(22) && 24 bytes total
>load serial
>call serial with mp && execute asm routine

These type of asm routines was perfect with FP 2.x and I nearly wrote all my Novell call routines with asm plus many routines to check existing drives, their types, reading and writing to absolute sectors etc. With VFP (and 32 bit environments like NT) I had to totally discard them.
>Cetin


Cetin, thanks for such a comprehensive answer. My company is considering a move to NT environment and there was concern that some old FPD apps would not run smoothly then - judging by other people's responses, looks like there's a number of limitations.

Srdjan