J2ME programming issues

hi all,
i started work in J2ME recently, i m little confuse that for one task i have to develop different programme for different devices.
can anyone elaborate it that for what tasks we have to develop different programs and for what task i have to make one programme and run on any device regardless of devices constraints.
and also differentiate between the nokia 60 series, 40 series and like thats issues.
plz if its not possible here refer me any good tutrial regarding these issues.

Dear friend,
          I am a final year post graduate student in computer science .I selected J2ME Technology to do my final semester project. As I am just novice in J2ME, I need help from masters
Like the guys in this forum. Please go through the following sentences and do help me please. I will be thankful to you if u do so.
Profile:
          The module comes as part of a college portal. The college has a placement cell and each student register in the site with his/her details and also the mobile no. The recruiter who wishes to conduct campus selection also registers in the site and they be provided with facilities to search CVs, Post jobs and all. So the concerned students will be filtered out and they are informed via SMS.
Problem:
          Even though I am doing a J2ME based project, there involves nothing to be done via J2ME technology as the mobile handset itself has the provision to send and receive SMS. Then what the hell I have to do?
What I need:
          How can I incorporate mobile in this project .What I mean is that what all ways can we make use of mobile via MIDP application. So dear please dig up ideas to help me get out of this imbroglio. And contact me as early as possible or my future will be a thick dark fumes.
Regards,
dEVIL.

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