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µÎ¹øÂ° ÇØ°áÃ¥Àº ÀÌÁ¡ virtualization ±â¼úÀ» °¡Áö°í °£´Ù. À¯»ê OS °¡»ó ±â°è¸¦ Á¢´ëÇØ¼, À¯»ê ½ÅûÀº ¹«¾ùÀÌµç ³ª¾ÆÁö±â À§ÇÏ¿© ¹«¾ùÀÌµç ¸ð¸¦ °ÍÀÌ´Ù. Virtualization Á¦¾È ¹«°Å¿î ¼º°ú ºñ¿ë¿¡ °¡µæ Â÷ÀÖ´Â ½Åû Áö¿ø ±×·¯³ª. ±â°è¼³ºñ Áö¿øÀº ¶ÇÇÑ ¿¹¸¦ µé¸é 3D µµÇ¥ °°ÀÌ ÀÚ¿øÀ» °øÀ¯ÇÑ °Íµµ °ï¶õÇÑ ÇÏ´Â ¿ø½ÃÀÎ ÀÌ´Ù. ±×°ÍÀº ¶ÇÇÑ »ç¿ëÀÚ°¡ À¯»ê ¿î¿µ ü°èÀÇ °¢ ¹öÀüÀ» ¼³Ä¡ÇÒ ¼ö ÀÖÀ» °ÍÀ» °ÍÀÔ´Ï´Ù ¿ä±¸ÇÑ´Ù.

Á¦½ÃÇÑ ÇØ°áÃ¥Àº ¿©·¯°¡Áö·Î µÑ ´ÙÀÇ Á¦ÀÏ Á¶±ÝÀ» °¡Áö°í °£´Ù. It works first by detecting if the application was written for the native operating system. If not, it will load the application with its respective legacy system binaries. The accommodate the difference in system calls between the legacy binaries and native kernel, an Application Compatibility Module is placed in between to act as a translator for these calls. In certain cases where a comparative native system calls may not exist at all, the ACM could also be smart enough to provide the same functionality as the missing system call.
Hypothetically speaking, if the system detected an XP application it would load the XP system binaries (ex. system32_xp) and then a XP-to-WinNext compatibility module.
The benefit of this solution is it offers much broader application compatibility with relatively low investment on Microsoft¡¯s behalf on the scale of per-application - they will only have to write a ACM for each legacy system they wish to support. Legacy applications will also be able to take full advantage of the system resources as a native application, because there is no emulation involved.
Notable Windows on Windows - the compatibility system used to provide 16-bit on 32-bit systems support and 32-bit on 64-bit systems support uses a similar concept.
One of the biggest gripes from most Windows enthusiasts has been the bloat legacy compatibility forces into Windows. Whilst this patent doesn¡¯t specifically mention so, I presume such ACMs are modular and can be installed and removed on demand. For example, if you need to run Windows Vista applications in future versions of Windows, you will only download and install the Vista ACM Pack (with Vista binaries) for that operating system. Those who do not require legacy support will then be not required to install any ACMs.
Thinking about it, it could become a business model to sell ACMs separately to Windows - reducing the overall cost of Windows and charging a tiered price for legacy support. A cheaper and less bloated Windows, wouldn¡¯t that be nice.
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