![]() ![]() The VMS Interrupt Priority Level became the Interrupt Request Level in NT, the Asynchronous System Trap became the Asynchronous Procedure Call, a Fork Procedure became the Deferred Procedure Call, while some other terminology was copied verbatim. The similarities between VMS and NT are striking. For Cutler and his team, “ WNT” was the working name for the OS (increment each letter by one from VMS). It also had the NTVDM for MS-DOS compatibility, the win16 WOW system for older Windows compatibility, an OS/2 compatibility subsystem, and a POSIX subsystem for UNIX compatibility. As a result, NT was a fully 32 bit microkernel operating system with paged virtual memory and the win32 API operating in protected mode with fully pre-emptive multitasking. NT needed to have some compatibility with MS-DOS, OS/2, and UNIX (all systems Microsoft supported, sold, and developed at some level at the time ). Similar to his experience at DEC, Cutler was very quickly placed as the lead of the NT project. They did, however, have ample experience with both portable code and with varied hardware platforms. (If you forget, you can manually check one version against the other to ensure important messages are retained, but it's messy and time consuming.Cutler and his team had nearly zero experience with either OS/2 or with PCs. CAUTION: Do not open Thunderbird again on the original computer - unless you repeat the process in reverse to transfer the folder contents back to the original computer before opening the app.
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