Open DATASET--how it works? URGENT!!

hi all experts,

I have made an internal table and was using GUI_DOWNLOAD function module to download from that internal table to a specified file. But now instead of GUI module i need to use OPEN DATASET condition to put my data into application server.

So am confused for its syntax, PLZ help!!

what i have is :

Open Dataset DIR_RSYN for output in Text mode.

Transfer i_tab2 to DIR_RSYN.

Close dataset DIR_RSYN.

DIR_RSYN being the directory and i_tab2 being the internal table so is it this way how to use this or not? coz some error is being displayed? PLZ HELP URGENT!

REWARDS would be provided!!