INSTALL--Notes

INSTALL does not create an environment for a program it loads. Therefore,
slightly less memory is used if you load a program with INSTALL rather than 
from your AUTOEXEC.BAT file. Some programs might not run correctly if they
are loaded with INSTALL. Do not use INSTALL to load programs that use
environment variables or shortcut keys or that require COMMAND.COM to be
present to handle critical errors.

Order of CONFIG.SYS processing

All INSTALL commands are processed after any of the DEVICE commands and
before the command interpreter is loaded. You cannot load a memory-resident
program before a device driver loaded with the DEVICE command.