Many of us have more than one Operating System installed in our systems but if we wish to login into another OS after booting into the first we will have to first reboot the computer and then wait for the BIOS to list the boot options.
This usually consumes lot of time and hence is irritating, so here is a tool called iReboot that does all that work for you. iReboot resides in the taskbar while consuming only 400 KB of the memory and listing you the operating systems to reboot into.
What you need to do is just run this program and select the OS you wish to reboot into instead of pressing restart, waiting for Windows to shut down, waiting for your BIOS to post, then selecting the operating system you want to boot into. Just select the entry from the iReboot options and let it do the rest.