Returns the separator character used in the file path names by the operating system. On Windows machines, this character is '\'; in UNIX, it is '/'; in VMS, it is '.'.
PATHCHAR
A string.
#define DSPMACREAD(S)
macread(strcat("DSP", pathchar, "macros", S))
defines the macro DSPMACREAD to read in macro file, S, from the "macros" subdirectory of DSP.
PATHCHAR is helpful for setting up folders for menus and SPL functions.