dual boot with command line for fdisk

I have a computer with QNX and Dos loaded into two partitions. I use fdisk in both to switch back and forth to the primary boot drive. I read somewhere about creating a script file to be able to run through fdisk to have a single command to switch the primary boot. The actual text said one can use the script file for single line deleting and creating partitions. I didn't know if this can be done for switching the primary partition, but I would like to try.
The text says to enter your commands for fdisk in the script file and in the Dos command line enter "fdisk(less than sign)name.scr". I've been trying this, but haven't gotten it to work. Everytime I run it I see a flash of fdisk(so I know it opens it) and I see an "Invalid key entry" in the bottom left of the screen. Fdisk never makes it past the large hard drive screen. I have tried different combinations with spaces, using .txt, even .bat, but nothing.
I have a couple of questions, maybe pertaining to it not working, maybe not. One, the text I read said to hit Ctrl+p then Ctrl+m for enter and a music symbol will appear for enter, well that didn't give me anything, but when I hit Ctrl+p and Ctrl+n I get a music note looking symbol and didn't know if this is correct. Second, what about spaces, should there be any spaces between the commands or not.

 

What you describe is correct, the symbols for enter are those music notes.

There shouldn't be any spaces between the commands. You should enter the commands just as you would enter them if you were using fdisk fullscreen.

A.J.