You do not need a Mac to get the UDID of a device (iPhone, iPad, etc.).  You can use iTunes, or have the UDID emailed to you.

Here are two different ways to do it, and you can pick which is easiest:

iTunes method:

  1. Plugin your iPad to the computer and start iTunes.
  2. Select your iPad on the Devices list on the left hand panel.
  3. Click on the Summary Tab.
  4. Now click on the Serial number (the actual text “Serial Number”) to see the serial number and other detail.  At some point, the text will change to the phrase “Identifier (UDID)” followed by a series of characters.  Send the characters to whoever needs them.

App Store method:

  1. On your iPad, go to the “App Store”.
  2. Type “udid sender” in the search box at the top left corner.
  3. Install UDID Sender.
  4. Run UDID Sender, and have it email the UDID to whatever email address.

I guess I recommend the iTunes method, simply because you have to get iTunes working between your computer and iPad anyway for app testing.  There are quite a few steps to getting everything working properly, but iTunes will prompt you as you go, so it is pretty painless.

None of this requires a Mac.  This will work on Windows . . . I generally use Windows for development, so I know this through practice.   Specifically, app testing does not require a Mac.  Ad hoc publishing can be done with Adobe Air solutions and a Windows PC, and you can email your ad hoc app to everyone who needs it.