DrvrInstall
DrvrInstall Install a driver
OSErr DrvrInstall(drv rHandle, refNum );
Handle drv rHandle; [TOKEN:64769]to driver
short refNum ; driver RefNum (-1 through -64)
returns Error Code; 0=no error
DrvrInstall is used to install a driver. A DCE for the driver is created and
its handle entered into the specified Unit Table position (-1 through -64). If
the unit number is -4 through -9, the corresponding ROM-based driver will
be replaced.
drv rHandle handle to driver
refNum driver RefNum (-1 through -64)
Returns: an operating system Error Code.

Notes: Inline glue for this routine is given below:
pascal OSErr DrvrInstall(Handle drv rHandle, short refNum)
= {0x301F,0x205F,0x2050,0xA03D,0x3E80};