Some IBM PC compatibles do not have a key labeled `Del' or `Delete' {is this true?}. Those that do generally have it in an inconvenient location. (Also, in some terminal emulators, the `Del' key does not transmit DEL.) The result is the standard "BackSpace invoking help" problem (see question 133).
The usual solution, suggested by Michael Covington <mcovingt@aisun1.ai.uga.edu>, is to somehow tell the terminal emulator program that BackSpace should transmit DEL. Read the program's manual. Shift-BackSpace or Control-BackSpace may send DEL. The `Del' key may only send DEL if the NumLock key hasn't been pressed.