...mode,
This mode is controlled by the compile-allow-cond-fallthrough parameter (see section 9.4.1.5). The default mode of a running MzScheme depends on command line arguments or internal settings established by an application with an embedded MzScheme. 
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...transformation.
Since an internal macro definition is not a regular internal definition, there is no ambiguity about whether an internal macro definition applies to previous expressions that are potentially internal definitions; the macro only applies to expressions after the macro definition. 
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...application.
It is possible that a clause in a case-lambda expression can never be evaluated because a preceding clause always matches the arguments. 
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...bits
30 bits for a 32-bit architecture, 62 bits for a 64-bit architecture. 
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...itself.
This definition of eqv? technically contradicts R5RS, but R5RS does not address strange ``numbers'' like +nan.0. 
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...numbers.
The random number generator uses a relatively standard Unix random() implementation in its degree-seven polynomial mode. 
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...stack<%>
A bracketed percent sign (``<%>'') is used by convention in MzScheme to indicate that a variable's value is a interface. 
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...stack%
A percent sign (``%'') is used by convention in MzScheme to indicate that a variable's value is a class. 
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...rename).
This set! restriction avoids certain bad forms of variable aliasing. 
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...unit-body-expr.
A unit-body-expr definition cannot shadow a syntax form or macro name. The detection of unit definitions is the same as for internal definitions (see section 3.5.5), so the define and define-struct forms can be used for definitions. 
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...seconds:
The ``@'' in the variable name ``f1@'' indicates (by convention) that its value is a unit. 
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...variables,
Of course, a signature can be specified as an immediate signature. 
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...distinct.
Element names are compared using the printed form of the name. This is different from any other syntactic form, where variable names are compared as symbols. This distinction is relevant only when source code is generated within Scheme rather than read from a text source. 
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...Dybvig.
See http://www.cs.indiana.edu/scheme-repository/doc.proposals.exceptions.html 
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...semaphore.
In MrEd, a handler thread for an eventspace is blocked on an internal semaphore when its event queue is empty. Thus, the handler thread is collectable when the eventspace is unreachable and contains no visible windows or running timers. 
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...thunk.
The nested thread's current custodian is inherited from the creating thread, independent of the custodian argument. 
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...expand-defmacro.
More precisely, the current namespace is used by the evaluation and load handlers, rather than directly by eval and load. 
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...string;
Using the default port write handler; see section 11.1.9. 
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...listeners.
In MrEd, custodians also manage eventspaces. 
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...string.
The backslash is a character in the string, so an extra backslash is required to specify the string as a Scheme constant. For example, the Scheme constant "\\1" is ``\1''. 
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...read
Flushing is performed by the default port read handler (see section 11.1.8) rather than by read itself. 
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...read-char-proc.
The default peek-char-proc relies on special internal support from peek-char and read-char to implement peeking. 
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...port:
Assuming that the current port display and write handlers are the default ones; see section 11.1.9 for more information. 
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...expanded.
Under Unix and BeOS, expansion does not convert multiple adjacent slashes to a single slash. However, extra slashes in a pathname are always ignored. 
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...invocation.
For MrEd, the executable path is the name of a MrEd executable. 
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...exception.
Under Windows, file-exists? reports #t for all variations of the special filenames (e.g., "LPT1", "x:/baddir/LPT1"). 
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...HREF="node132.htm#mztime">11.4).
For FAT filesystems under Windows, directories do not have modification dates. Therefore, the creation date is returned for a directory (but the modification date is returned for a file). 
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...name
The name "localhost" generally specifies the local machine. 
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...connection.
For most machines, the answer corresponds to the current machine's only internet address. But when a machine serves multiple addresses, the result is connection-specific. 
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...error,
The standard error port is placed after the process id for compatibility with other Scheme implementations. For the same reason, process returns a list instead of multiple values. 
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...namespace.
The eval procedure actually calls the current evaluation handler (see section 9.4.1.6) with e to evaluate the expression. 
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...eval.
The load procedure actually just sets the current load-relative directory and calls the current load handler (see section 9.4.1.7) with file-path to load the file. The description of load here is actually a description of the default load handler. 
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...process
The set of environment variables is not saved. When an image is restored, the environment variables of the restoring program are transfered into the restored program. 
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...executable.
In the PLT distribution of MzScheme for Unix and BeOS, the collects directory is in the top-level plt directory, rather than with the platform-specific binary or with the script in plt/bin. 
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...NAME=218517>
MrEd initializes the current-library-collection-paths parameter in the same way. 
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...filenames.
A MzScheme compiled code file should use the extension .zo, but this convention is not enforced. 
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...immutable.
A properly implemented define-const-struct is not inconsistent with define-struct. It simply has not been implemented, yet. 
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...f.
The returned procedure actually accepts any number of arguments, but immediately raises exn:application:arity if f cannot accept the provided number of arguments. 
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...unchanged.
The internals counts of some semaphores may be temporarily decremented if multiple semaphores become available at once. 
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...semaphores.
But the internal counts of some semaphores cold be temporarily changed. 
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PLT