Remote access is the best term to describe that only without enabling the file and printer sharing option or being aware of a made public not private network setting. As far as seeing MS or someone else simply logging onto your system remotely that wouldn't be something predesigned into Windows. ISPs keep records of your online activities however in case a need arises or to track down spammer domains.
Digital formal or non formal signatures have always been tucked away often where only other developers will know where to look. That would be the "Easter egg" you were referring to which is placed in a way as to be non intrusive and may only simply appear as a number or small item in the system registry itself that goes unnoticed by the untrained user there.
Here's the latest heard on this.
Operating systems News
Microsoft denies NSA backdoor in Windows 7
US National Security Agency did, however, work on the new OS
19 hours ago
A row brewing in the US over the security features of Windows 7 has been nipped in the bud after Microsoft claimed it has not engineered a backdoor to give authorities access to user's PCs
The existence or otherwise of a backdoor became an issue when it emerged that the US National Security Agency (NSA) had been involved in the development of Windows 7
The rest of that is seen at http://www.techradar.com/news/softwa...ndows-7-652929
Gee? I guess the end on that one with the "more to come" wasn't too far off there!
The rest is seen at http://www.windows7update.com/NSA-he...1goOv7RcF4YI18
NSA helped harden Windows 7 Security Date: November 24, 2009 The National Security Agency (NSA) worked with Microsoft on the development of Windows 7, an agency official acknowledged yesterday during testimony before Congress. "Working in partnership with Microsoft and elements of the Department of Defense, NSA leveraged our unique expertise and operational knowledge of system threats and vulnerabilities to enhance Microsoft's operating system security guide without constraining the user to perform their everyday tasks, whether those tasks are being performed in the public or private sector," Richard Schaeffer, the NSA's information assurance director, told the Senate's Subcommittee on Terrorism and Homeland Security yesterday as part of a prepared statement. "All this was done in coordination with the product release, not months or years later during the product lifecycle," Schaeffer added. "This will improve the adoption of security advice, as it can be implemented during installation and then later managed through the emerging SCAP standards." Security Content Automation Protocol, or SCAP, is a set of standards for automating chores such as managing vulnerabilities and measuring security compliance. The National Institute of Standards and Technologies (NIST) oversees the SCAP standards.