After-hours traders were keeping most stocks close to the flatline in what amounted to a fairly quiet session following big losses during the regular day.

WorldCom was the most active stock on Instinet after the close Monday, but the voice and data service provider's shares were flat at $1.84. Peregrine Software ( PRGN), which was hammered in regular trading, inched up 1.1% to 90 cents.

Volume was on the light side. In the first hour of the extra session, around 1.9 million shares had changed hands among the top-20 most active stocks on the Instinet platform.

The Nasdaq 100 Unit Trust ( QQQ - Get Report) was slipping 0.1% to $28.94, and Cisco ( CSCO - Get Report) was tacking on 0.2% to $12.92 the day before its quarterly earnings report.

Elsewhere, Intel ( INTC - Get Report) was gaining 0.8%, and IBM ( IBM) was adding 1.1%. In regular trading, Big Blue gave up 7%. ( AMZN) was up 0.1%, Sun Micro ( SUNW) was gaining 0.7%, and Microsoft ( MSFT) was down 0.3%.

Apple ( AAPL) and Hewlett-Packard ( HPQ) were flat with their 4 p.m. EDT closing levels.

Serena Software ( SRNA) was one of the biggest losers, falling 18% to $9.35 after the company lowered its guidance for the coming months. Mobile Mini ( MINI) was dropping almost 10% to $24.90 as the company met expectations for the latest quarter but warned of a shortfall for the full year.

Providian Financial was among the top winners, adding 5.5% to $6.70. Following the close, the credit card company said its first-quarter earnings plunged from the same period a year ago, but the result matched estimates.