How to make a form only appear on one player index's screen

[ryono]

uhh yeah, I didn't know where to put questions for source edits so I put it here. sorry if it's in wrong place. but I need help with calling a form from client.vbp through sadscript. I also want this form to only show up on the person's screen that activated it. My goal is to make a npc talk box, a box that will show what the npc is saying, such as giving you quests and what not. but yeah if you can help me, thankyou.

[unnown]

call senddatato(index, "open" & sep_char & "hello" & end_char)

and in moddata (client)

if parse(0) = "open" then
  frmopen.visible = true
  frmopen.label1.text = trim(parse(1))
end if

and also wrong thread, put it in source questions next time