To set MIDlet execution options:
Select Tools > Preferences and click the MIDP tab.
When you check the Disable User Security Prompts option, the SDK stops displaying security prompts when you run MIDlets. Checking this box is equivalent to changing all Ask first and Ask every time permissions to Allowed.
The size of the KVM memory heap (heapsize) controls how much memory the MIDlet can take to run. The maximum heapsize you can enter is 10MB. The maximum heapsize for the Nokia X3-02 is 2 MB.
You can simulate the memory constraints of different devices. Let’s say you are working on a device that has a maximum heapsize of 320K. You may want to adjust the heapsize on the SDK to 320K to verify that the MIDlet can run in this memory space. To set a new value for the KVM heapsize, check Set KVM heapsize and specify a new value. The new KVM heapsize takes effect the first time you run a MIDlet after you set the heapsize. See -Xheapsize option in Options for general use.
A Record Management System (RMS) file is a file a MIDlet creates that remains after the MIDlet ends. For example, an RMS file from a MIDlet might contain scores from the last time you played a game. By default, the SDK saves RMS files in the PC file system, making them persistent. To simulate the behavior of a newly installed MIDlet, you can remove any old RMS files from the SDK by checking Delete record store (RMS) files before starting MIDlet.