Uptime for Windows 2000/NT
Almost every unix distro comes with a utility called "uptime" that tells you how long your server has been running. Unfortunitly no such tool comes with windows, but there is a pretty fool proof way to determine the date you computer was last started. Type the following in to the command prompt.

net statistics server

The net command is very useful, it allows you to connect to shares, start services, send messages between computers and more. To learn more about it type:

net help

Here are some examples using the net command.

List all accounts in a domain:

net accounts /DOMAIN

Send a message to all users in the domain (a text box pops up). Replace /DOMAIN with a username to send to just one user.

net send /DOMAIN "The server is rebooting"

Start a service

net start "Service Name"

Stop a service

net stop "Service Name"