Help with Gnome-PPP, IDE for C, Compiz

[hotshot05]

Just installed Linux Mint 9 Isadora yesterday. This is the 1st distro that I have installed to my HDD. Am loving Linux BTW

Question1:
I use my mobile(Nokia 5130XM) and my Airtel MO connection to connect to the net.
I used the wvdialconf command to get the phone detected. Also edited the wvdial.conf file at /etc

I can use the wvdial command to get connected to the net. Actually I am connected by this method right now
I tried to use Gnome-PPP to connect. I put *99# as phone number and tried to connect. But It always says "Could not use Modem"
Can you tell me how to configure Gnome-PPP ????

I am including my wvdial.conf file contents here:

[Dialer Defaults]
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Modem Type = USB Modem
Baud = 460800
Stupid Mode = Yes
New PPPD = yes
Modem = /dev/ttyACM0
ISDN = 0
Phone = *99#
Password = A
Username = B

Question 2:
I use the Turbo C++ compiler in Windows(the one with the blue screen) to write and run my programs.
Is there any such IDE for Linux?
Or do I have to use GCC to compile and run the programs and Gedit to write the programs???

Question 3:
The Compiz effects are great. But I have not yet been able to get the Cube on the Desktop even though in the Simple Compiz settings, I have selected Desktop Cube instead of Desktop Wall in Appearance. In many pics I have seen that there is a small cube on the desktop with the 4 desktops on the 4 sides which I can spin with a mouse.
I am using a laptop with an Intel 4500mHD onboard graphics though.
Is this card enough for running Blur?