void vfuncgroup(int group, char *fmt, ...);
This C function is identical to the
vfuncheader function except that it
will not output a new header if the last call to
vfuncgroup was with
the same group number and there have been no intevening
The group argument is an integer value specifying a group number. Each
option within a program using this function should have its own unique group
number. However currently there is no allocation system for ensuring that this
is so. The fmt and subsequent arguments specify the header in the
printf style. The header, after formatting, must be less than
8192 bytes long.
This is the Tcl interface to the vfuncheader C function. The title must be less 8192 bytes long.