ok, first of all, with xLib you have two screens so to say.
One screen is the normal screen.
The other screen is some backup screen (screen buffer). Everything you draw onto the normal screen is also drawn to the backup buffer, but you can optional just write to the backup buffer, the user doesn't see this.
Remember the last parameter of drawing sprites being one so that it updates the screen? That is because xLib draws all the time to the backup buffer, with that being one you tell the calc to copy everything from the backup buffer to the normal screen. Leaving it 0 would just draw it to the backup buffer and you wouldn't see it on the screen.
You could also just do real(6) to copy everything from the backup buffer to the normal buffer.
Now, you could draw a lot of stuff into the backup buffer, store everything from the backup buffer into a pic, clear again the backup buffer, draw some other stuff there (e.g. a menu), and then update the LCD by e.g. using real(6) and so you have created the pics you need for sprites without that the user notices that!
I hope you get my explanation

Yep, and that other screen on the backup buffer you can copy to a image with real(9,2,<picnumber>), then you can clear the backup-buffer with real(0,0) and draw some new stuff to the backup-buffer, and then let the user see everything with real(6)

It saves it in ram. You'll have then if you go to the memory menu and select pics some wiered names with pic numbers greater than 10. But that doesn't mind. Remember that you CAN'T recall them with recallPic <num>, you need to use real(3 like this:
real(3,rPIC_Num,rPIC_Method,Recall_UpdateLCD)  (copied from the readme)
rPIC_Num = PIC to recall PIC0 - PIC255
rPIC_Method = The copy method 0 = Overwrite, 1 = AND, 2 = OR, 3 = XOR
Recall_UpdateLCD = Toggle LCD update 0 = No, 1 = Yes   // is if it should copy the backup buffer to the screen of not

But if you want real power you should use DoorsCS instead of xLib, that gives you even more features for later on and it gives you a epic GUI and also allows you running archived programs from homescreen. It is found here: http://www.cemetech.net/programs/index.php?mode=file&path=/beta/dcs72b2.zip

But if you want real power you should use DoorsCS instead of xLib, that gives you even more features for later on and it gives you a epic GUI and also allows you running archived programs from homescreen. It is found here: http://www.cemetech.net/programs/index.php?mode=file&path=/beta/dcs72b2.zip

meh... it depends...
keep in mind that Doors is 3 app pages(49152 bytes), a pretty sizable amount.
Depending on the end user's calculator model, I'm not sure if they'd want to have to install a giant app

edit: ninja'd

Stevon8ter the xlib commands are all still the same, and it adds the Celtic III library, PicArc, and several more, including a few of its own commands

I see, well, i'm going to install it but for now i'll use only the xlib commands in ly prog, so the user can choose if they install doors or only xlib

That's a great idea, i always try to make checkig to make sure nothing goes wrong, this time i didn't think of it yet

EDIT1: before i forget, the x-y coordinates for sprites, is it upper-ledt corner or upper-right or ...?