PSINET AND QUARTERDECK TO PROVIDE FAST, RELIABLE, LOW-COST INTERNET ACCESS

SANTA MONICA, CA, & HERNDON, VA, June 5, 1995--Quarterdeck Corporation
(Nasdaq:QDEK) and Performance Systems International, Inc. (PSINET;
Nasdaq:PSIX) today announced that they will provide Connect and Play
access to the Internet from Quarterdeck' s next-generation Internet
products planned for release later this month. Quarterdeck software users
will receive a free PSINet Instant InterRamp account, allowing them to
explore the Net' s resources at no cost for seven days.

This partnership will allow Quarterdeck customers to create an Internet
account in under 10 minutes. PSINet's Instant InterRamp makes this
possible by automatically configuring the system software and application
software. Instant InterRamp configures the user's account so that all of
the arcane information needed to connect to the Internet is taken care of
quickly and easily.

"Forming an alliance with PSI--one of the largest Internet service
providers in the U.S.--is consistent with our plan to reach the largest
number of individual, small office and home office Internet users, making
accessing the Internet easy and instantly gratifying for first-time
users," said Gaston Bastiaens, Quarterdeck president and chief executive
officer, "We are continually looking for ways to leverage our existing and
developing Internet technology."

The agreement between the companies will result in two product offerings.
Quarterdeck will distribute the Internet application suite via its retail
channels with PSINet's Instant InterRamp service as an Internet access
option. PSINet will distribute Quarterdeck's Internet application suite as
part of the Instant InterRamp software series, marketed and promoted by
PSINet.

"Our commitment," said Martin Schoffstall, senior vice president and chief
technology officer at PSINet, "is to provide Internet users with the
fastest, cost efficient, and most flexible connection available. We look
for partners who provide that same level of quality in their software
products. Quarterdeck has a reputation for producing market leading
utility and application software and we are proud to be teamed up on this
project."

Instant InterRamp is PSINet's personal connection to the Internet for the
single user needing full power Internet access to run any commercial or
public domain TCP/IP applications. InterRamp users can connect directly to
the Internet at up to 28,800 bits per second (bps) for fast World Wide Web
access. For users who want even higher port speeds, PSINet offers the
option of 64K bps ISDN service. PSINet's Instant InterRamp service offers
users the choice of two payment plans: $9 for nine hours a month or $29
for 29 hours a month. Once users have exceeded their allotted time,
additional hours are $1.50 per hour.

Quarterdeck Corporation is a leader in the development of software products
that enhance the performance of computers by maximizing the usefulness of
existing PC software, hardware and networking systems. Quarterdeck
develops, markets and supports software products in three strategic
business areas: Utilities; Remote Computing; and Internet Products.

Quarterdeck Corporation is located at 150 Pico Boulevard, Santa Monica, CA,
90405. Further product, availability and pricing information can be
obtained by calling (310)392-9851; through Quarterdeck's Internet Web site
at http://www.qdeck.com/; or by sending a mail request to info@qdeck.com.

PSINet is a leading provider of commercial access to the Internet and
internetworking services for organizations and individual users of
electronic information. PSINet services range from direct personal
connections to-full turnkey integration solutions for local area networks
in the PSINet wide area network system and the Internet.
 
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