To create markers on your screen:
1. Set your screen resolution to 800 × 600.
2. Open a web browser and maximize it.
3. Do a full-screen capture.
4. Reset the screen resolution to 1024 × 768, maximize the web browser
again, and do another full-screen capture.
5. Set the screen resolution to 1280 × 1024 (or other preferred working size),
and do one more full-screen capture (without any open applications).
6. Open your favorite picture editor, load the largest screen capture, and
paint the entire thing black (or whatever color you want).
7. Paste a copy of the 1024 × 768 screen in the center of the 1280 × 1024
black screen and draw small crosses at the corners.
8. Erase the pasted screen, leaving behind the crosses.
9. Repeat that step with the 800 × 600 screen, drawing more crosses at
the corners.
10. After you erase the 800 × 600 screen shot, you’re left with a 1280 × 1024- pixel black screen with two sets of crosses. You can label the crosses if you like (we used to at the beginning, but soon realized it wasn’t necessary).
11. Save the whole thing as a .bmp file in your Windows directory, and set it as your background (centered, not tiled or stretched). It also helps to set the background color of your screen to the same color that you chose for the picture (so that the icon labels blend into the background better).
It sounds very complicated and time consuming, but really it’s very easy and only takes about five minutes total time.