I want to add my project to another program

for exmpale, i did a prog that asks u for name+password. now, i want this program to be attached before a game i have on pc, how DO i DO it?

The simple way is to add your code and forms to your game. The not so simple way is at the start of your game program shell (either Visual Basic "Shell" or API "ShellExecute") to the password program and wait for it to finish then check a return value to see if right password entered.