can 2 seperate MSN users lock in at the same time with one pc?

yes once you have windows live messenger and messenger plus ... just select "allow multiple accounts"(or something like that) during set up and your away

go to the following site:

http://www.mastaline.com/

and download the patch "WLM Universal Patch 1.0.0"
Double click this file
Check Multiple login
Click on Patch

Now login with as many accounts as you want....

well technically you could if you had 2 different versions of msn or 2 of the same versions running simultaneously theoretically its possible to do but you might need some kind of program to help support and run it. because it might cause allot of errors and stuff basically you would get the same program colliding because they are all run with the same commands but yes its possible

lock in? Do you mean login the same time? Well, you can use 2 or more different msn accounts but you need to use "3rd party" clients not the msn messenger. Use trillian or pidgin.

Trillian = http://www.ceruleanstudios.com/
Pidgin = http://pidgin.im/pidgin/home/

In fact you can use yahoo/google/msn etc all the same time even with multiple accounts.

you can't normally, you have to find a program on google that will enable it, i think its called msn polygamy? something like that

u need a program for that !!

Not unless you use something like Trillian.