snp_start

	status.i4.v = snp_start(plot_info.s.r [,erase_it.i4.v])

	This routine starts up a snapshot plot.

	plot_info	plot information structure (type is SNP_INFO)
	[erase_it]	plot erase flag
			(TRUE -> erase present plot (default),
			 FALSE -> start plot without erasing old one)

	This function returns ACNET status values as follows:

	OK			success
	CBS_WINDOW_TOO_BIG	plot window won't fit on screen

	This function requires the following include files:

	cnsparam_h, cns_data_structs_h, cbslib_h, acnet_errors_h

	Related functions:

	snp_start_plot_c, snp_start_plot_from_file_c, snpplt, snp_setup,
	snp_file_menu_c, snp_read_plot_setup_file_c, snp_set_sda_info_c,
	snp_export_data, fstplt, ftp_setup, ftp_start, ftp_file_menu_c,
	ftp_start_plot_c, ftp_start_plot_from_file_c,
	ftp_read_plot_setup_file_c, ftp_calculated_trace_c

	C/C++ usage:

	int	status;
	int	erase_it = TRUE;
	SNP_INFO	plot_info;

	status = snp_start(&plot_info,erase_it);