Vista and XP on the same partition

Vista and XP do not live happily on the same partition because they share Program Files directory. They could be installed on the same partition but WMP 11 would work in only one of them. The way to install is

1. Install Tiny Vista (no Media Center) first
2. Install XP. This would blow Vista bootloader and overwrite WMP in Program Files breaking it for Vista.
3. Using Vista DVD restore Vista bootloader. This would blow Vista validation thus Vista needs to be re-validated (by copying sources to HDD and running \sources\$OEM$\$$\INSTALL\startVista1.cmd (startVista2.cmd)).
4. Install Easy BCD and add XP boot.

Tiny Vista takes 4GB after update (2.82GB after install) vs. 10.6GB for plain Vista XP SP3 takes 1.75GB after update (1.3GB after install) vs. 2.76GB for plain SP2. Program Files would take 1.78GB min. Thus double install with minimal Office etc. would require at least 9GB (or 8GB for Tiny Vista alone).

Even with most everything stripped out Vista is hungry for RAM requiring ~300MB vs. 650MB for standard Vista vs. 160-180MB for XP.

Also, all Vistas but Ultimate do not allow Remote Desktop and log out whoever is logged onto console. RDS could be turned on (and log out fixed) with termsrv.zip on Business, Premium and on Ultimate it would fix log out problem.