One last suggestion, since we're getting you out of the stone age...
You should probably download a copy of the Windows 7 API documentation and have it at the ready as you work.
Download Details - Microsoft Download Center - Microsoft Windows 7 SDK (ISO)
Note: if you are on 32 bit OS you want GRMSDK ... if you are on 64 bits it's GRMSDKX
Just burn the ISO to a DVD and then run the setup program from the disk.
(There is a newer version but this one is better, trust me!)
There is also a copy of an older SDK (90% of the calls are there) that can be integrated right into POIDE giving you access to most API calls with F1 (just like your C library calls)...
http://www.pellesc.de/files/help/setup_Win98SDK.exe
If you are on Vista or Win7 you may need to download this upgrade...
Users may be unable to open Help (.hlp) files
Once you have it set up, simply open POIDE...
Click -> Tools -> Customize -> Help Files -> New (square box icon)
Enter menu text "Windows 98 SDK"
Browse and find guide.hlp in the win98sdk's folder...
Make sure this is the first item on the list.
Ok your way out... Exit and restart POIDE and put your cursor on a windows function call (eg. SetTimer()) and press F1... It should pop right up.
Similarly placing your text cursor on any C keyword should also bring up it's information by pressing F1 ...
The big Win7 SDK has to be accessed separately...