I am using an app called dslrcontroller which connects to and controls my Canon EOS cameras. It is in beta form but appears a very useful and competent app.
However its performance is restricted by the amount of memory allocated to apps on my Ainol Novo7 Tablet (running the latest version of Gingerbread. The developers recommend altering the settings in the root - /system/build.prop file, and the setting is named dalvik.vm.heapsize. Unfortunately, although I am very familiar with Windows "under the hood" I am new to Android.
I am hoping that some helpful and knowledgeable person in the forum will be able to guide me (by the hand) to this file so that I can make the necessary changes.