Transaction Codes

Transaction Codes - Explaination
sm21 - logs error
pa03 - payroll lock to release 'period'
smartform - creating smart form
se37 - view program
se38 - change and view program
pa20 - view infotype
pa30 - change and view infotype
spro - change overview
su01 - List ID user
se10 - To see transport number
stms - check transport
se11 - Check table with structure
se16 - Check table