The XMB is open as soon as you turn the PSP on
XMB stands for Cross Media Bar, it is the horizontal menu bar on a Sony PSP.
XMB stands for Xcross Media Bar. An XMB is a graphic interface that Sony developed for use in it's Playstation gaming devices. The XMB allows the user to navigate via a set of icons on the screen.
The PS3™ system includes a user interface called XMB™ (XrossMediaBar).XMB CLEARY STANDS FOR XscrossMediaBar.PS3 IS BETTER THAN XBXO 360!PS3 FTW!
XMB is not for the computer it stands For xross(cross) media bar for the sony playstation 3 and the psp systems
XMB is the Xross Media Bar, it's the scrollable menu you see, from which you access your games and system tools.
The 'XMB' (Cross Media Bar) is the scrolling menu you see when you boot up a PSP. It's already on every PSP.
The XMB on the PS3 is the name for the menu or list that covers the screen from right to left with settings, photos, video, games, network and also allows you to go up and down within these different categories. The related link has instructions for background changes of the XMB
mod your psp and get xmb editor
You have to install it under "Game" in the XMB
The XMB (Cross Media Bar) is the PSP's horizontal menu that you see when the PSP finishes booting up. It has system options on the left, and game options on the right.
Settings menu on the xmb