How to get the preferred environment variable path separator?

[Chris Marusich]

Hi,

Info node "(guile) File System" describes a procedure for getting the
preferred file name separator of the operating system:

--8<---------------cut here---------------start------------->8---
 -- Scheme Variable: file-name-separator-string
     The preferred file name separator.

     Note that on MinGW builds for Windows, both ‘/’ and ‘\’ are valid
     separators.  Thus, programs should not assume that
     ‘file-name-separator-string’ is the _only_ file name
     separator—e.g., when extracting the components of a file name.

--8<---------------cut here---------------end--------------->8---

Is there an equivalent procedure for getting the preferred environment
variable path separator, too?  I would expect such a procedure to return
the ":" string (or does it return a character?) on most GNU/Linux
distributions, since that is the separator e.g. for the PATH environment
variable.

While we're on the topic, Guile's manual has a lot of very nice,
detailed information about each module.  However, it does not seem to
tell me what the name of the modules are.  Where can I find out what the
name of any module described in the manual - e.g. the module which is
described in the Info node "(guile) POSIX"?

-- 
Chris

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