this would really help
The best reference is the Unity Scripting Reference : Unity - Scripting API:
Use the search box on the top left. Let’s do a general one. In the search box at the top left, type in : GUI
Clicking on the first search result leads here : Unity - Scripting API: GUI
On this page you can see all the variables and functions =]
Click on a function to see the description and an example using script.
Now search Transform.
the first result should lead here : Unity - Scripting API: Transform
Again, just click on a variable name or a function and see a description and script example.
This is by far the best way, as MonoDevelop does have intellisense but for JS it is just not reliable (sometimes shows all the derivatives, sometimes does nothing).
Use the Unity Scripting Reference and it’s little search box as much as possible =]
Assuming you are using c# you can find the keywords from Microsoft