automatically assigned email and password

the idea of PTP is that your facebook account becomes the point of access.

so if you want to add a new computer, go to that machine and login to your facebook account.

then access the progress thru processors app, click on "dashboard" in the menubar, and then click "add computer".  this will connection you to a page that will allow you to download software for various platforms.

when you download an installer in this way, you will not need to provide your email and password. 

ok, a couple issues --

first, about accessing project servers --

before the end of they year i expect we'll be able to provide direct access to functions hosted at project servers, like project forums, teams, etc.  at present, as you have suggested, if this is important to you, there is a workaround:

join the projects or join GR prior to adding the PTP app at facebook. (probably is it easiest to join GR since this way you can join all your projects at once.)  in either scenario-- joining at projects or joining projects via GR-- you will have an email+pw login that can be used to access the project servers directly.

if you have already joined PTP, this is not a problem.  just do this:

• at facebook: remove PTP via the facebook menubar item: facebook settings > applications settings
• in your desktop software: "detach" your desktop software by clicking the menubar item advanced > stop using gridrepublic.  (if you don't see the menubar, click the "advanced" button in the lower right.)
• go to gridrepublic and create your GR/project accounts
• go back to facebook and re-add the PTP application.  this time, at the registration page, in the first question, check "no, i have a boinc/GR account"

...and then all should be straightforward, and you will be attached in PTP but still have an id you can use to login at projects.

When I start PTP on another PC,there is error

"Authorization failed connecting to running client.

Make sure you start this program i n the same directory as the client"

fyi, uninstall instructions (copied from the PTP User FAQ):

FOR WINDOWS 

• To remove the application, go to Start > Control Panels > Add/Remove, and then click "Remove" Progress Thru Processors

• To delete your account information and program data, delete the "BOINC" folder, which can be found here:
• For Windows Vista and Windows 7 -- C:\ProgramData\BOINC
• For Win2000/WinXP users -- C:\Documents and Settings\All Users\Application Data\BOINC 

FOR MAC

• To remove the application, run the "Uninstall Progress Thru Processors" application that is included with the installer.

• To delete your account information and program data, delete the "Progress Thru Processors" folder:
• /Library/Application Support/BOINC Data
• /Users/[username]/Library/Preferences/BOINC Manager Preferences 

Okay, here's how you do it people. From a machine that you have logged into, copy the following files to the directory you're running BOINC out of on the destination system:

account_boinc.bakerlab.org_rosetta.xml
account_climateprediction.net.xml
account_www.malariacontrol.net.xml
acct_mgr_login.xml
acct_mgr_reply.xml
acct_mgr_request.xml
acct_mgr_url.xml

When you start the client up on that system, it will attempt to log in using those details. The signing key will fail, as I guess this is against the systems hostname or something, but it just seems to get re-signed, and logs in successfully. The new system will now appear in your 'my computers' tab in the GR control panel.

How much I advise this I don't know... there's not much point having an account if you don't control it yourself (after all, your account and your credits could just be taken from you at any moment, you don't know your password so tough) ... it may just be better to get your own account if the situation really is that your account obtained through the facebook app isn't really your own account.