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The CPU ID of the machine on which MAINSAIL is running is returned as a STRING, if it is available. If unavailable, the null STRING is returned. The CPU ID is unavailable on many operating systems; see the appropriate operating-system-specific user's guide for details.
On some operating systems, a configuration bit can be set to cause MAINSAIL to call a user-defined PROCEDURE for $cpuID. The user defines a PROCEDURE $alternateCpuID in an FLI MODULE called $aCpuID; this mechanism is documented in detail in the operating-system-specific user's guides for the systems on which it is supported.
MAINSAIL Language Manual, Section 32.62