The @testflag() function takes two arguments: a number, and a string.
It will test if the object specified by the number has the flag
specified by the string. It returns "1" is the thing has the flag,
and "0" otherwise. For example, my dbref number is 204. To test if
I'm a wizard, run:

@testflag("204", "wizard")

To test if the current player is set jumpok, run:

@testflag("%#", "jumpok")