Group of steps, like login steps for vBulletin:

Group #1 {Login steps vwwatercooled for example}:
//*[@class="fc-button-label"]
//*[@class="loginbutton"]
//*[@id="vb_login_username"] { set username }
//*[@id="vb_login_password"] { set password }
//*[@class="button"]

Group #2 {Login steps other vBulletin}:
//*[@class="fc-button-label"]
//*[@id="lnkLoginSignupMenu"]
Switch to iframe
//*[@name="username"] { set username }
//*[@name="password"] { set password }
//*[@id="idLoginBtn"]