Thank you Robert for your help about "Send Message",

Now you maybe can help me in others questions.
I'm writing a program that list all users from a
NT Domain in a ComboBox, in another Combo I fill
with groups for each user. I did this using two BATs:

*** USERS.BAT create a list of all users
NET USER /DOMAIN > USERS.TMP

*** DETAILS.BAT create a file with Full Name
*** Comment and groups that user belongs

NET USER %1 /DOMAIN > DETAILS.TMP

I open these files in low level and get all informations
that I need. My question is: There is a more simple way
using API?