what is my client center ?

My Client Center (MCC) is a powerful tool for handling multiple AdWords accounts. MCC is ideal for large advertisers with more than one account and for third-party agencies, such as search engine marketers (SEMs), search engine optimizers (SEOs), and automated bid managers (ABMs). You can think of MCC as an "umbrella" account with multiple AdWords accounts (a.k.a. "managed accounts") linked to it.

MCC users can:

Easily view multiple managed accounts, including other MCC accounts, via the My Client Center view.
See relevant information for all managed accounts in one place.
Run reports across multiple managed accounts at once or download the My Client Center view into a .csv file.
Use a single login to access all managed accounts.
Create and link AdWords accounts from within your MCC account.
Owners of individual managed accounts can, as always, sign in to their AdWords accounts and maintain access to their login information.

How do I get a My Client Center account?
It's easier than ever to sign up for a My Client Center account. Just visit www.google.com/adwords/MyClientCenter, click "Sign up now," and follow the step-by-step instructions.

Labels
With labels, you can organize your client accounts into meaningful groups and find important accounts quickly and easily.

You can use labels to organize accounts based on your day-to-day MCC activities. For example, you might create a label like “important” to keep track of key client accounts. Or label old accounts “inactive,” then you can easily filter them out of the dashboard. You can also group accounts by vertical (ex: ”travel” or “retail”) or by who works on them (ex: ”Mary’s accounts”). And you can apply multiple labels to a single account.

Once you’ve created a label, you can filter to quickly see all accounts with or without that label.

Any labels you create will be visible only to users who log directly into your MCC. Those users can apply and edit your labels, but no one else will be able to see them
About the new My Client Center interface
The new My Client Center (MCC) interface is a new look and feel for your MCC account. It doesn't change the core functionality of the MCC but is designed to help you complete key MCC tasks more easily.

New features and functionality
We've got a few new features we think you'll enjoy. With the new interface, you can:


Edit client descriptions inline
Link several client accounts -- you can now enter multiple customer ID numbers when linking
Unlink directly from the table -- no need to drill down into a client account to remove it from your MCC; now you can remove accounts from the MCC dashboard directly

Compare the new version with the old
During this beta period, you can switch back and forth between the new and old interfaces at any time. Just use the "View new MCC interface" and "Return to previous MCC interface" links.

We'd love to hear what you think. If you've got feedback to share, just click "Send feedback" in your MCC account.

How do I link or unlink an MCC account?
Your My Client Center (MCC) provides functionality so you can easily link and unlink an existing or new AdWords account to your MCC. Below are instructions for linking and unlinking accounts to your MCC.

Linking an existing AdWords account

To link an existing AdWords account to your MCC:

Retrieve your client's AdWords Customer ID number (which appears in the upper right corner of AdWords account pages).
Sign in to your MCC at https://adwords.google.com.
Click Link existing account, which appears above your managed accounts table.
Enter your new client's Customer ID number in the appropriate field.
Identify the access level you are requesting ('User interface and API' or 'API only') depending on whether you will be providing traditional account management services (which may include API services as well) or only program-based management (solely API) services.
Click Submit.
When you click Submit, the client will receive an account notification that invites him/her to link to your account. During this process, you'll see a pending notification for the (soon-to-be) managed account in your MCC. Upon the client's acceptance, you'll receive a confirmation notification and the account will be automatically linked to your MCC.

Linking a new AdWords account

To create an AdWords account and link it to your MCC:

Sign in to your MCC at https://adwords.google.com.
Click the Create new account link above your managed accounts table.
Complete the form, and click Create Account.
Click Create a campaign to create your client's campaign in the AdWords sign-up wizard. Then, return to your MCC to enter your client's billing information. You'll need to enter this information to activate your new managed account. You can also return to this step later by clicking the managed account in your main MCC view.