Too sad that I forgot who told me this neat little trick...

Enter QUERY for displaying the FORM SETS command, but immediately
before pressing Return, home the cursor and clear the display. This
way the terminal line numbers will match the dataset number (ok, it
might be neccessary to delete a few blank or header lines near the
top of the screen buffer). You can place the cursor on the dataset
name of interest and find the number in the line counter of terminal
or terminal emulator...

Lars "who did not invent this neat little trick" Appel