Waiting for a Shelled Program to Finish

I went to this thread and used the code found at the link below but there was a compile error.

Pausing until shell unzip has completed
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http://www.vb-world.net/tips/tip5.html

The variable ret& is not defined. Can I just go ahead and define it?
Is this supposed to be a long variable? Why is there an amperstamp after it?

Public Sub ExecCmd(cmdline$)
Dim proc As PROCESS_INFORMATION
Dim start As STARTUPINFO

'Initialize the STARTUPINFO structure:
start.cb = Len(start)

'Start the shelled application:
ret& = CreateProcessA(0&, cmdline$, 0&, 0&, 1&, _
NORMAL_PRIORITY_CLASS, 0&, 0&, start, proc)

'Wait for the shelled application to finish:
ret& = WaitForSingleObject(proc.hProcess, INFINITE)
ret& = CloseHandle(proc.hProcess)
End Sub


Please Help!!!

Open "flag.txt" For Output As #2
Print #2, "1"
Close #2

Open "test.bat" For Output As #1
command="Your command"
Print #1, Command
Print #1, "del flag.txt"
Close #1

Exists = Dir("flag.txt")
Shell ("text.bat")
Do While Exists <> ""
DoEvents
Exists = Dir("flag.txt")
Loop
:D

Yes, just define it. (inside the sub)

Dont bother with the type, it isn't particularly important (although in this case it should be long).

Thanks!