define verb PREFER
 
	image sys$login:PREFER.exe
 
	parameter P1		! Disk name
	label=disk_name
	prompt="Disk Name"
	value(type=$device,required)
	disallow ((NOT host_name) AND (NOT force))
	disallow ((NOT host_name) AND (NEG force))
 
	qualifier HOST
	label=host_name
	nonnegatable
	value(type=$quoted_string,required)
 
	qualifier FORCE
	label=force