First, here are several definitions found on the WWW:
The cost basis for each security in your portfolio is adjusted to its closing price each day. If you hold a security overnight, your true purchase basis goes away in lieu of the new "closing price" cost basis assigned to each security each day.
As an example: If you buy the security on Monday for $10/share and it closes at $11/share on Monday, Tuesday's cost basis is $11/share, and your account will see a PnL of $1/share for Monday. If the security ends Tuesday at $10.50/share then a -$0.50/share PnL is booked to your account for Tuesday and Wednesday's cost basis becomes $10.50/share.

Open a DOS prompt (by clicking your computer's START menu and selecting RUN and typing "cmd" - Win98 users use "command"). At the prompt, which will look something like this: "C:\>" If you are running Windows NT or Windows 2000, type in "ipconfig /all" If you are running Windows 98, type in "winipconfig." After you have typed it in, your computer will display a Windows IP Configuration. It will look like this:
IP Address. . . . . . . . . . . . (IP address = series of 4 numbers separated by dots)