Yes, as Peerless answered...

But...
Enabling ANY application that is dependent on an established and stable internet connection (other than an Anti-Virus program) to launch automatically on startup is an extremely bad idea.

Regardless of the numerous applications out there that come with the defaults set to auto-launch on start, it is a very foolish thing to do... The likelihood of the application launching before you have a stable connection is very great.

There can be only 2 marginal justifications for auto-launching a p2p client...
Because the authors of the client wish to more or less force you to share files whenever you are connected to the internet...
or
Laziness bordering on a medical problem status !!!

ALWAYS best for you to drive as much as possible.

__________________
Fusion for REAL!--CDex 1.51--Wackyuses--Bitzi - Check Files Before Download !--.mp3 File Name Change Problems? Try Rename-It!--Alternate PORTS--Avast- Anti-Virus--WindowWasher--IrfanView--PC Pitstop - Test your PC !--Mac OSX Troubleshooting--GO .ape ! - For 'Lossless' Audio Compression--Port :6346 - Test If It Is 'Blocked'--Cole2k Codecs--OldVersion - Newer isn't always better !
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Tomorrow's forecast:
Sunni in places, Shi'ite in others...