These are the main device drivers added by pen for OS/2:
  DEVICE=C:\CONCERTO\CONCERTO.SYS
  DEVICE=C:\PEN\EMI.SYS
  DEVICE=C:\PEN\EIQO2.SYS
  SET PENPM=C:\PEN;
  SET PENDEV=C:\CONCERTO;
  
  If you want to use rodent.sys, so something like this:
  DEVICE=C:\OS2\BOOT\POINTDD.SYS
  device=c:\os2apps\rodnt100\rodent.sys
  DEVICE=C:\OS2\BOOT\MOUSE.SYS TYPE=RODENT$
  DEVICE=C:\OS2\MDOS\VMOUSE.SYS
  
  Modified Environment variables:
  Added to LibPath: C:\Pen\DLL;C:\Pen\Gesture
  Added to Path: C:\Pen
  Added to DPath: C:\Pen;C:\Pen\DLL;C:\Pen\Install
  Added to Help: C:\Pen\Help
  Added to BookShelf: C:\Pen\Tutorial
  
  
  The key was to load 'concerto.sys' before 'pointdd.sys'.  The install program
  did not put them in this order for me, however it apparently worked the
  first time for others.
  
  Good luck,
  
  -jeff