PE> 1. Where is the DOS.SYS documentation?  (typing "HELP 
 PE> DOS.SYS" at the OS/2 prompt doesn't give me help on 
 PE> that).

I don't think it is documented.  I figured out the reboot ioctl by hacking
it (circa OS/2 1.2).

 PE> 2. Is it documented that putting a $ sign on the end of DosOpen starts 
 PE> communication with the driver of that name?  (GUIREF20 
 PE> for DosOpen doesn't appear to make a mention of that).

A device driver can use any name it wants.  DOS.SYS just decided to use
DOS$.  There is nothing magic about the $.


--- Maximus/2 3.00