It's nearing 11 on Friday night at The Wolf teen club in Herndon, and 18-year-old Mark Sette is settled back in his front-row chair listening intently to the heavy-metal music of the band Sister on stage.

Sitting and standing all around Sette in the small club are dozens of other teen-agers, clad in jeans, shorts and tennis shoes, some sitting quietly and still in their seats, others bopping their heads and clapping to the music.

The scene could be anyplace that teen-agers gather and listen to a live band. But on this night, Sette and his peers are enjoying a new spot tailored for them: a teen club and hangout that does not serve alcohol. Located at 201 Elden St. in Herndon along a quiet, landscaped strip of brown brick office buildings, The Wolf features live bands, disc jockeys, dancing and food.

Owner Coleman Anderson says he wanted to offer teens an alternative social spot on weekends.

"They've been run out of Georgetown . . . and {society is} cracking down on beer and drinking," Anderson said, citing trends he thought made the time ripe for a nonalcoholic teen club.

"The kids that come here all love it. They want the adult atmosphere. They don't want the parents standing around. No one hassles anyone here."

In Virginia, the legal drinking age is 21. The District has the same minimum, but persons who turned 18 before September 1986 may buy beer and wine.

Since it opened April 10, the club has attracted varying crowd sizes, from 50 to 250, Anderson says. Initially there was a $3 cover charge, but after a few weeks, Anderson increased the fee to $5, because teen-agers do not spend much money once inside. "My check average was 75 cents," Anderson said.

"I've been here ever since the place opened," Sette said. "I like it mainly because it's a place for kids to go without getting into trouble, without seeing alcohol."

On this night, teen-agers in clusters walked in and out of the club, listening to a set of songs and then leaving. Just to the right of Sette, Alyssa Carrio and Erica Eppler of South Lakes High School were dancing with their new friends Colleen Hogan and Laura Peterson of Lake Braddock High School as Sister played the likes of "Rockin' Into the Night" by .38 Special. The girls had not known one another before that night.

"I just like the fact that I can dance {here}," said Peterson, an 18-year-old senior. "There's no teen-age dancing clubs."

Fifteen-year-old Coby George stopped by for an hour to hear the band from Oakton Senior High School, Life in General. "It's a place to go without getting into trouble," said George, who attends Oakton.

The Wolf, which is open only Friday and Saturday nights from 7 p.m. to midnight, gets its name from The Wolf Trap Deli, the main business on the property. After the deli closes on Fridays, a stage is pulled out, eating tables are rearranged and club signs are hung. Live bands are featured on Friday nights and disc jockeys on Saturday nights. The two formats attract a vastly different crowd, according to Anderson, who said the disc jockeys bring in more formally dressed teens.

Club owner Anderson said it is too early to tell if the club will be successful. He's hoping for a big turnout June 18 -- the last day of school in Fairfax County.