How to learn Windows XP .NET framework version?

Look at registry:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP

Use ENTER key instead TAB key?

protected override bool ProcessDialogKey(Keys keyData)
{
if (keyData == Keys.Enter)
{
Control c = this.GetNextControl(ActiveControl, true);
if (c != null)
{
c.Focus();
}
}
return base.ProcessDialogKey(keyData);
}

How to measure program performance in c#?

DateTime start = DateTime.Now;

Code.....

TimeSpan end = DateTime.Now.Subtract(start);
MessageBox.Show(end.TotalMilliseconds.ToString());

C# DateTime Formats

DateTime.Now.ToString("dd.MM.yyyy HH:mm");

What are Microsoft Office Tools Scanning commands?

Run line command:

Viewer: MSPVIEW
Scanner: C:\Program Files\Common Files\Microsoft Shared\MODI\11.0\MSPSCAN.EXE