Network Mangement Inc. of Fairfax, a systems integrator for local- and wide-area networks, acquired Net-Tech Inc. of Norcross, Ga., for an undisclosed amount. The Net-Tech office will become NMI's Southeast regional headquarters.

Net-Tech, a privately held company located outside Atlanta, designs and installs local-area networks. Its clients include Kraft Foods, US Sprint Communications Co., the Internal Revenue Service and O'Neal Steel.

According to a company statement, the acquisition is part of NMI's strategic plan to identify, purchase and integrate established companies nationwide that offer expertise in network computing.

People Karch International of Chantilly, which provides companies with health-promotion, fitness and child-care services, acquired PAL Corporate Child Care of Silver Spring. Terms were not disclosed.

The firm, which changed its name to PKI Corporate Child Care, manages six centers in the Washington area and has plans to build two more centers in early 1991.

Landmark Systems Corp. of Vienna agreed to acquire a virtual telecommunications access method performance monitoring software package from Highland Research Inc. of Birmingham, Ala. Terms of the agreement were not disclosed. Landmark will begin distributing the product early next year.

Armstrong World Industries Inc. of Lancaster, Pa., purchased Inquire/Text, a text management system developed by Infodata Systems Inc. of Falls Church for an undisclosed amount.

Long Distance Service Inc. of McLean was awarded a contract by Bell Atlantic Mobile Systems to provide long-distance services for Bell Atlantic's cellular telephones.

Digital Equipment Corp. of Washington entered into an agreement with American Management Systems Inc. of Arlington to jointly market AMS's Federal Financial System accounting software for Digital's Vax family of computers.

Wilson Hill Associates Inc. of Washington was awarded a contract for $2.5 million from Grumman Data Systems Corp. of Woodbury, N.Y., to provide training and other technical services over the next two years to the Defense Logistics Agency.

International Business Machines Corp.acquired the distribution rights to manufacturing software developed by Reston-based Industrial Computing Designs Corp. The software, called the Process Operations Management System, was introduced in June and is being used by more than 25 manufacturing operations.

Penril DataComm of Gaithersburg, a subsidiary of Penril Corp., was awarded a contract by US Sprint to provide transmission products for use in the Public Data Network operated by US Sprint.

Nelson Business Systems of Manassas was awarded a contract by the city of Manassas to install the computer network in the city's new police department building.

Strategic Marketing Group of Alexandria began a program to assist federal government contractors in developing business activities outside the government.

Barusso-deRaat Associates Inc. opened in Washington to assist buyers and sellers of travel agencies in the Washington area.

French and Associates Inc., a marketing and public affairs firm, will open in Washington in early December.

The Maryland Executive Suite Association was formed in Baltimore to promote the advantages of short-term office leasing arrangements.

Rebman Design International, an interior architecture and design firm, moved its offices from Arlington to Washington.

Spectrum Human Resource Systems Corp. of Denver opened an office in Calverton.

Glass Blocks of Virginia of Springfield opened a new showroom in Springfield.

VideoFile of Cleveland, which provides television news monitoring services, opened an office in Columbia, Md.

ViCom PhotoGraphics of Rockville opened an office in Olney.

The Boat Owners Association of the United States of Alexandria opened a marine center in Rockville to replace a Beltsville facility.

Just So Stores Inc. and Just Boys Inc. opened in Reston.

Announcements of news and developments affecting Washington area companies should be sent to Regional Report, Business News Department, The Washington Post, 1150 15th St. NW, Washington, D.C. 20071.