
plsfnam: Set output file name 

DESCRIPTION:

	Sets the current output file name, if applicable.  If the file name
	has not been specified and is required by the driver, the user will be
	prompted for it.  If using the X-windows output driver, this sets the
	display name.  This routine, if used, must be called before
	initializing PLplot. 

SYNOPSIS:

plsfnam(fnam)

ARGUMENTS:

    fnam (const char *, input) :    Pointer to file name string. 
