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The following program lists the ABAP programs with out any transaction code (or not assigned to a transaction code).
Most of the ABAPer or who ever use SAP at some point stuck at the point to know or remember Transaction codes.
The following list displays the set of useful T-Codes for SAP System Administrator. These are T-Codes used by Basis Team on regular day-to-day basis.
(Any additional T-Codes are welcome 
Assigning a T-Code to an ABAP Query can be done in two ways. By first method, you assign Query Program Name to the T-Code. In second, you assign the Query directly to the T-Code.
It is recommended not to assign Query program name directly to trnasaction code in case of queries(prefer method 2 than method 1), because Queries are generated and may vary system by system. But I have seen first being used more.
There are some cases where you want your application to call the Maintenance View (instead of creating Create/Changes/Delete i.e. CCD screens for the operation).
In this case you have to assign a T-Code to the Maintenance View you created. (Note: User should have the authorization for SM30).
