status.i4.v = snapshot_choose_plot(device_name.i1a.r, subsystem.i2.r,
					   record_number.i2.r, user_id.i2.r,
					   user_key_1.i2.r, user_key_2.i2.r)

	This routine allows the user to select a snapshot plot for the
	requested device out of those presently available.

	device_name	desired device name (DEVICE_TERSE_NAME_LEN characters)
	subsystem	returned subsystem ID number
	record_number	returned record number
	user_id		returned user key ID
	user_key_1	returned user defined key #1
	user_key_2	returned user defined key #2

	This function returns status values as follows:

	0			no selection made
	1			success
	2			error

	This function requires the following include files:


	Related functions:

	snpplt, sr_get_device_c, window_restore_hint_c

	C/C++ usage:

	static const char	device_name[DEVICE_TERSE_NAME_LEN+1] = "M:OUTTMP";
	short	subsystem;
	short	record_number;
	short	user_id;
	short	user_key_1;
	short	user_key_2;
	int	status;

	status = snapshot_choose_plot(device_name,&subsystem,&record_number,