Module Pool Info REQ???

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Hi

I need some info abt the deque-nque concept in module pool,also abt the commit area statemnts in it.

I had an issue,in which the user runs an application in mdoule pool,like 3 users simaltenouly at a location,if any time they press the SAVE button at the same time,the application generate a unique no. all time,but in the case of same time SAVE butting pressing,one 1 no is generated & is same displyed to all users,thus only 1 records is stored in the table,but in actual it shd be 3.

So i need to solve this ,can any one tell me how to do ?

I sthete any deque-nque concept whcih can be applicabe here,or any think like I can lock the no of users at a particular location or i can find the no. of users & than generate the no. at a location based on the users.also in the case of same time SAVE button pressing.

Plz tell me in brief,i am a beginner in module pool.

Regds